House Intelligence Committee Chairman 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.) suggested 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 possible impeachable offenses include bribery in an interview set to air Wednesday with NPR’s Steve Inskeep.

"On the basis of what the witnesses have had to say so far, there are any number of potentially impeachable offenses: including bribery, including high crimes and misdemeanors," Schiff said in the interview. "The basic allegations against the president are that he sought foreign interference in a U.S. election, that he conditioned official acts on the performance of these political favors."

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In the interview, Schiff said bribery, one of the offenses the Constitution outlines as impeachable, had a different meaning at the time the Constitution was written than how it is commonly understood today.

“It was much broader. It connoted the breach of the public trust in a way where you're offering official acts for some personal or political reason, not in the nation's interest,” Schiff said. “Here you have the president of the United States seeking help from Ukraine in his reelection campaign in the form of two investigations that he thought were politically advantageous, including one of his primary rival.”

“It doesn't have to be cash. It can be something of value,” Schiff added, saying that conditioning foreign aid on political favors could be considered bribery even in the modern context.

“And clearly, given the concerted effort that was brought about to get these investigations going by the president, by Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE, by Ambassador [Gordon] Sondland, by others, this was something of great value to the president,” he said.

These comments from Schiff follow a marked shift in the rhetoric used by Democrats to describe what they believe are impeachable offenses committed by President Trump.

As the public hearings draw nearer, Schiff and others have sharpened the language they use to speak about the president, dropping the phrase "quid pro quo" and centering their argument around more caustic, widely used terminology such as "bribery" and "extortion."

House Democrats opened the impeachment inquiry in late September after a whistleblower filed a complaint alleging that during a July 25 call, Trump urged Ukrainian President Volodymyr Zelensky to launch an investigation into 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.