Democratic Rep. Ro Khanna Rohit (Ro) KhannaOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package The movement to reform animal agriculture has reached a tipping point MORE (Calif.) said on Wednesday that it "defies logic" for 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 to have pushed Ukraine 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 in a call where others were listening in.

"For me, it's very simple. It just comes down to why is the word Biden there so many times," Khanna told The Hill's Steve Clemons at the "Aspirations: Arab Youth and Modern Dream" panel at the Newseum.

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"If you're going after corruption, if you're going after foreign policy objectives, fine," Khanna, who is the co-chairman of Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE's (I-Vt.) 2020 bid, said. "But it just defies logic that you would continually focus on Joe Biden, who happens to be the person beating you in the polls all summer."

"You'd think just out of common sense if you have 25 people listening in on something, you'd be careful, but not this president," he continued.

Khanna's comments came at an event hosted by The Hill and underwritten by the Embassy of the United Arab Emirates in Washington, D.C.

He spoke shortly before the first public hearings in the House impeachment inquiry kicked off on Capitol Hill.

House Democrats are investigating Trump's push for Ukraine to investigate Biden and his son, Hunter Biden.

The top U.S. diplomat in Ukraine, William Taylor, revealed in his testimony that U.S. Ambassador to the European Union Gordon Sondland told a member of his staff that Trump cared more about an investigation into Biden than he did about Ukraine.

Meanwhile, Trump continued to slam the impeachment hearing as a "witch hunt" and a "hoax" during an Oval Office meeting with Turkish President Recep Tayyip Erdoğan.

“I’m too busy to watch it. It’s a witch hunt, it’s a hoax, I’m too busy to watch it. So, I’m sure I’ll get a report,” Trump said.

“There’s nothing — I have not been briefed. There’s nothing there. I see they’re using lawyers that are television lawyers, they took some guys off television. You know. I’m not surprised to see it, because [House Intelligence Committee Chairman Adam] Schiff can’t do his own questions,” Trump continued.