WASHINGTON -- House Speaker John Boehner says it is "inconceivable" that top White House officials didn't tell President Barack Obama once they learned the Internal Revenue Service had been targeting conservative political groups for extra scrutiny when they applied for tax-exempt status.

The White House says top officials, including chief of staff Denis McDonough, learned of an impending inspector general's report on the matter in late April. Obama has said he didn't learn about it until seeing news reports on May 10, the day the story broke.

The inspector general's report said conservative groups were targeted during the 2010 and 2012 elections. But there has been no evidence the White House knew about it until this spring.

Boehner was interviewed on ABC's "Good Morning America."

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  • This video image provided by House Television shows Rep. Gabrielle Giffords (D-Ariz.) and House Speaker John Boehner of Ohio, on the floor of the House on Capitol Hill in Washington, Wednesday, Jan. 25, 2012.

  • Rep. Gabrielle Giffords (D-Ariz.) and House Speaker John Boehner of Ohio, on the floor of the House on Capitol Hill in Washington, Wednesday, Jan. 25, 2012.

  • Speaker of the House John Boehner (R-Ohion) seems to fight back tears while listening to Australian Prime Minister Julia Gillard address a joint meeting of the U.S. Congress from the floor of the House of Representatives at the U.S. Capitol March 9, 2011 in Washington, DC. Gillard emphasized the long and strong bond between her country and the U.S.

  • Speaker of the House John Boehner (R-Ohio) seems to fight back tears while listening to Australian Prime Minister Julia Gillard address a joint meeting of the U.S. Congress from the floor of the House of Representatives at the U.S. Capitol March 9, 2011 in Washington, DC. Gillard emphasized the long and strong bond between her country and the United States.

  • Speaker of the House John Boehner (R-Ohio) seems to fight back tears while listening to Australian Prime Minister Julia Gillard address a joint meeting of the U.S. Congress from the floor of the House of Representatives at the U.S. Capitol March 9, 2011 in Washington, DC. Gillard emphasized the long and strong bond between her country and the United States.

  • Fighting back tears as he recounted his rise from humble beginnings to the presumed Speaker of the House, House Minority Leader Rep. John Boehner (R-Ohio) addresses the Republican National Congressional Committee's midterm election results watch party at the Grand Hyatt hotel November 2, 2010 in Washington, DC. Major news organizations have said that the Republicans will win enough seats to take control of the House of Representatives.

  • Fighting back tears as he recounted his rise from humble beginnings to the presumed Speaker of the House, House Minority Leader Rep. John Boehner (R-Ohio) addresses the Republican National Congressional Committee's midterm election results watch party at the Grand Hyatt hotel November 2, 2010 in Washington, DC. Major news organizations have said that the Republicans will win enough seats to take control of the House of Representatives.

  • House Republican leader John Boehner, R-OH, fights back tears as he addresses the National Republican Congressional Committee Election Night Results Watch event in Washington, DC, on November 2, 2010. An emotional John Boehner, the presumed speaker-elect of the US House of Representatives, told fellow Republicans at the victory party that Americans have sent President Obama message to 'change course'.

  • Fighting back tears as he recounted his rise from humble beginnings to the presumed Speaker of the House, House Minority Leader Rep. John Boehner (R-Ohio) addresses the Republican National Congressional Committee's midterm election results watch party at the Grand Hyatt hotel November 2, 2010 in Washington, DC. Major news organizations have said that the Republicans will win enough seats to take control of the House of Representatives.

  • Astronaut Neil Armstrong (L) recievces the Congressional Gold Medal from Speaker of the House John Boehner (R-Ohio) during a ceremony in the Rotunda of the U.S. Capitol November 16, 2011 in Washington, DC. The gold medals were presented to Armstrong and his fellow crew members from Apollo 11, Michael Collins and Buzz Aldrin, and to astronaut and former U.S. Senator John Glenn (D-Ohio), the first American to orbit the Earth.

  • Astronaut Neil Armstrong receives the Congressional Gold Medal from Speaker of the House John Boehner (R-Ohio) during a ceremony in the Rotunda of the U.S. Capitol November 16, 2011 in Washington, DC. The gold medals were presented to Armstrong and his fellow crew members from Apollo 11, Michael Collins and Buzz Aldrin, and to astronaut and former U.S. Senator John Glenn (D-Ohio), the first American to orbit the Earth.

  • House Speaker John Boehner <a href="http://www.youtube.com/watch?v=ufYmnD3fhfk&feature=related" target="_hplink">chokes up in an interview on CBS</a>.

  • Speaker of the House John Boehner (R-Ohio) wipes his eyes as outgoing Speaker of the House Nancy Pelosi (D-Calif.) prepares to hand over over the speaker's gavel following his election in the House chamber January 5, 2011 in Washington, DC.