WASHINGTON -- Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, and Defense Secretary Leon Panetta warned Sunday that allowing the sequester to go into effect would be damaging for both the military and the country at large.

"We will become less safe," Dempsey told NBC's "Meet the Press."

Under the sequester, the federal budget will be cut by about $1.2 trillion next month unless Congress acts to avert those across-the-board reductions. The looming sequester had been put in place as part of an attempt to push lawmakers to agree on budget cuts, by threatening less-targeted reductions if they failed to act broadly. The threat didn't work.

Panetta told "Meet the Press" that the Department of Defense is preparing for the sequester, despite assurances from some lawmakers that they will not allow it to go into effect.

"We've got a plan for that possibility, because there are so many members that are saying, you know, 'We're gonna let it take place,'" Panetta said. "But I have to tell you it is irresponsible for it to happen. I mean, why in God's name would members of Congress, elected by the American people, take a step that would badly damage our national defense, but more importantly undermine the support for our men and women in uniform?"

He also said he thinks that President Barack Obama is doing all he can to push Congress to avert the sequester, but that it is ultimately up to the legislators.

"If Congress stands back and allows sequester to take place, I think it would really be a shameful and irresponsible act," Panetta said.

Meanwhile, on ABC's "This Week," Senate Majority Leader Harry Reid (D-Nev.) showed why averting the sequester will be contentious on Capitol Hill. A number of Republicans have said they will not couple budget cuts to replace the sequester with revenue raisers. Reid, though, said Democrats will not accept a deal without them.

"The American people are on our side," Reid said. "The American people don't believe in these austere things. We believe that the rich should contribute. We believe we should fill those tax loopholes -- get rid of them, I should say. And that's where we need to go."

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    New Secretary of Defense Chuck Hagel is greeted as he arrives for his first day at the Department of Defense, on February 27, 2013 in Arlington, Va. (Photo by Drew Angerer/Getty Images)

  • Leon Panetta (July 2011 - February 2013)

    Secretary of Defense Leon E. Panetta pauses while speaking during a ceremonial swearing-in at the Department of Defense July 22, 2011 in Washington. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Robert Gates (Dec. 2006 - July 2011)

    Robert Gates speaks during his ceremonial swearing in as the 22nd defense secretary on Dec. 18, 2006 at the Pentagon. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Donald Rumsfeld (Jan. 2001 - Dec. 2006)

    U.S. Secretary of Defense Donald Rumsfeld holds his press conference at the Pentagon briefing room on Jan. 26, 2001 in Arlington, Va. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • William Cohen (Jan. 1997 - Jan. 2001)

    Secretary of Defense designate William Cohen testifies during confirmation hearings before the Senate Armed Services Committee on Jan. 22, 1997 in Washington. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • William Perry (Feb. 1994 - Jan. 1997)

    U.S. Defense Secretary William Perry points to a reporter during a press conference on April 21, 1994 in Seoul, Korea. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Les Aspin (Jan. 1993 - Feb. 1994)

    U.S. Secretary of Defense Les Aspin released new regulations governing gays in the military during a press on Dec. 22, 1993 at the Pentagon. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Dick Cheney (March 1989 - Jan. 1993)

    U.S. Defense Secretary Dick Cheney (L) meets Egypt's President Hosni Mubarak, on April 3, 1989, at Washington. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Frank Carlucci (Nov. 1987 - Jan. 1989)

    U.S. Defense Secretary Frank Carlucci testifies before the Senate Armed Services Committee on July 13, 1988 in Washington. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Caspar Weinberger (Jan. 1981 - Nov. 1987)

    Caspar Weinberger, Secretary of Defense on Feb. 9, 1981. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Harold Brown (Jan. 1977 - Jan. 1981)

    General Alexander M. Haig, right, retired as NATO commander, walks with Defense Secretary Harold Brown during an awards ceremony on July 3, 1979 at Fort Myer, Va. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Donald Rumsfeld (Nov. 1975 - Jan. 1977)

    A 1976 photo of Secretary of Defense Donald Rumsfeld. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • James Schlesinger (July 1973 - Nov. 1975)

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  • Elliot Richardson (Jan. 1973 - May 1973)

    Elliot L. Richardson speaks to newsmen Oct. 23, 1973 at a press conference held at the Department of Justice. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Melvin Laird (Jan. 1969 - Jan. 1973)

    Secretary of Defense Melvin R. Laird as he departed from Andrews Air Force Base Md., for Paris on Jan. 5, 1971 in Washington. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Clark Clifford (March 1968 - Jan. 1969)

    This is an Oct. 1968 photo of Secretary of Defense Clark Clifford as he announces his support for President Johnson's decision to halt the bombing of North Vietnam. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Robert McNamara (Jan. 1961 - Feb. 1968)

    PARIS, FRANCE: US Secretary of Defense Robert McNamara smiles as he arrives 27 November 1965 at Paris' NATO headquarters. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Thomas Gates (Dec. 1959 - Jan. 1961)

    Secretary of Defense Thomas S. Gates Jr., center, poses with Benjamin M. McKelway, left, editor of the Washington Evening Star and President of the AP, and AP General Manager Frank J. Starzel at the April 25, 1960 meeting of the Associated Press in New York. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Neil McElroy (Oct. 1957 - Dec. 1959)

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  • Charles Wilson (Jan. 1953 - Oct. 1957)

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  • Robert Lovett (Sept. 1951 - Jan. 1953)

    Gen. Dwight D. Eisenhower (right) watches President Harry S. Truman and Gen. Omar Bradley help Defense Secretary Robert Lovett (left) get in place as the men posed on the south lawn of the White House on June 1, 1952 in Washington. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • George Marshall (Sept. 1950 - Sept. 1951)

    Anna M. Rosenberg, New York Labor and Public Relations consultant, who is named assistant secretary of defense, chats with Secretary of Defense George Marshall in a conference at the Pentagon on Nov. 9, 1950 in Arlington, Va. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • Louis Johnson (March 1949 - Sept. 1950)

    Defense Secretary Louis Johnson (right) gives new identification card to President Harry Truman at the White House on Nov. 9, 1949 in Washington, listing him as commander in chief for an "indefinite" term. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)

  • James Forrestal (Sept. 1947 - March 1949)

    James V. Forrestal, Secretary of Defense under President Harry Truman, is shown on July 26, 1947. (Source: <a href="http://www.defense.gov/specials/secdef_histories/">Department of Defense</a>)