CNN host S.E. Cupp questioned President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's allies for sticking by him as the impeachment inquiry continues, asking, "How much longer do they keep saying this was OK?"

Cupp described Trump's interaction with Ukraine and Ukrainian President Volodymyr Zelensky as "black and white" and "really, really simple" on her Saturday show "S.E. Cupp Unfiltered."

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"Now, you can decide whether all of this is impeachable or not, but it’s what happened, and the people surrounding Trump need to ask themselves a pretty serious question. How much longer do they keep saying this was OK?" Cupp said.

As the president faces an official impeachment inquiry in the House, many Republicans have stood by his side and defended him.

The CNN host also analyzed the president's reaction to the impeachment inquiry and categorized it as "DNA," meaning "deny, normalize and attack."

The president initially denied asking the Ukrainian president to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE. But once the White House released the summary of the call, he called the conversation "perfect."

Cupp said Trump has now moved "on to the attack stage," referencing Trump's tweets about Rep. Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.) and Sen. Mitt Romney Willard (Mitt) Mitt RomneyCrenshaw looms large as Democrats look to flip Texas House seat The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-Utah) on Sunday morning.

Schiff and the Do Nothing Dems have lost all credibility...but the corrupt Media is working hard to keep them in the game! https://t.co/VufsDqYUVu — Donald J. Trump (@realDonaldTrump) October 5, 2019

Mitt, get off the stage, you’ve had your turn (twice)! https://t.co/zz6TA6XoGe — Donald J. Trump (@realDonaldTrump) October 5, 2019

The House inquiry began after reports surfaced about Trump's request to the Ukrainian president, which came days after Trump decided to withhold military aid from Ukraine.

The president has criticized Schiff because of his leading role in the investigation and Romney for saying what Trump did was "wrong and appalling."