"Given the sensitive nature of the request, I appreciate your keeping that information closely held to those who need to know to execute direction", Duffey wrote in an added note of concern.
As Dana Bash asked Blunt for his thoughts on how Nancy Pelosi is maneuvering the impeachment process against Trump, the CNN host switched gears at one point and asked Blunt if the president's actions were "appropriate".
Schumer said the emails raise questions that must be answered.
The email was time-stamped 11:04am - an hour and 31 minutes after Trump's controversial July 25 phone call with Zelenskyy ended, according to a summary of the conversation released by the White House. Meanwhile, another Office of Management and Budget official, Edna Falk Curtain, told a senior defense official "I still have no insight on the rationale for the hold".
The historic votes Wednesday won the support of nearly all Democrats in the House chamber but not a single Republican, leaving Trump as only the third president in USA history to be impeached. The 1974 law restricts how a president can suspend congressionally approved funds.
Mike Duffey, a former Wisconsin GOP chair who Trump appointed to run the OMB's national security division, also indicated in the July 25 email that he wanted to hide the hold.
Newly released documents have revealed new details about how and when White House officials sought to suspend military aid to Ukraine as part of President Trump's effort to pressure Ukraine into launching an investigation which be politically beneficial to Trump's 2020 reelection campaign.
The move, which legal experts say violated USA law forbidding the president from "impounding" congressionally appropriated funds, prompted the House of Representatives to launch an impeach inquiry against the Republican president in late September.
He is only the third U.S. president to be impeached and faces trial in the Senate, possibly in January.
"It doesn't have to be an either-or", Short said on Fox News Sunday when Wallace asked if President Trump would ask Donald John TrumpClyburn the White House: "I won't be intimidated" for Trump as headlining evangelicals in the new Brazilian Bolsonaro says Trump will not pursue steel, aluminum tariffs MORE continue to believe Ukraine has interfered in the elections.
Mr Duffey, an OMB official working on national security issues, is one of four witnesses Senate Minority Leader Chuck Schumer has requested for the pending Senate trial of Mr Trump on two articles of impeachment passed by the House of Representative this week.
"The president was concerned about whether or not America's hard-earned taxpayer dollars should be spent into a country where there's been proven cases of corruption", he said.
Sen. Amy Klobuchar, a Minnesota Democrat, said Sunday that McConnell's partisan approach to impeachment was "a serious problem". Sandy stated in a closed-door residue before lawmakers in November he learned of Mr. Trump's decision to suspend the help via a July 12 email from Robert Blair, an aide to Mick Mulvaney, the behaving White House chief of staff.