Sen. John Cornyn John CornynBipartisan praise pours in after Ginsburg's death Chamber of Commerce endorses McSally for reelection Airline job cuts loom in battleground states MORE (R-Texas) on Sunday disputed the findings of a watchdog report that found the Trump administration's decision to withhold aid to Ukraine broke the law.

"[It's] certainly not a crime and something that no one had ever dreamed in the past would have risen to the level of impeachment," Cornyn said on CBS's "Face the Nation."

"This is one of the basic problems with the House's case."

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"Isn’t it central to that question of the president withholding aid for personal gain, which is the allegation?" host Margaret Brennan asked Cornyn.

The senator responded by defending President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE's actions related to Ukraine, stressing that the House-passed article of impeachment charging the president with abuse of power is not treason, bribery or a high crime and misdemeanor, which are laid out as reasons for impeachment in the Constitution.

.@JohnCornyn appears to dispute a watchdog report on Trump's withholding of aid to Ukraine: "[It's] Certainly not a crime and something that no one had ever dreamed in the past would have risen to the level of impeachment," he argues. pic.twitter.com/937yftfMSn — Face The Nation (@FaceTheNation) January 19, 2020

"This is the first time in history where a president has been impeached for a non-crime, for events that never occurred, ultimately the investigation never took place and ultimately the aid was delivered," Cornyn said. "This is really unique and I think every senator is going to take this very seriously."

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The Government Accountability Office (GAO) report claimed that Trump's decision to freeze the release of the security assistance violated the Impoundment Control Act (ICA) because funds approved by Congress were withheld "for a policy reason."

“Faithful execution of the law does not permit the President to substitute his own policy priorities for those that Congress has enacted into law,” the report said.

The report was released just before the Senate kicks off the next phase of the impeachment proceedings.

The House sent the articles of impeachment to the Senate late last week. This week senators will vote this week on the rules of the trial, including whether or not to allow witnesses as part of the process.