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.) said on Sunday that Congress is looking to obtain President Trump's calls with Russian President Vladimir Putin Vladimir Vladimirovich PutinWatchdog confirms State Dept. canceled award for journalist who criticized Trump Former intelligence agency director Robert Cardillo speaks out against 'erratic' Trump Kremlin: Putin calls for reset between US and Russia on cyber relations before elections MORE amid allegations that the White House is attempting to hide calls with foreign leaders.

"The paramount need here is to protect the national security of the United States and see whether, in the conversations with other world leaders and, in particular, with Putin, that the president was also undermining our security in a way that he thought would personally benefit his campaign," Schiff said Sunday on NBC's "Meet the Press."

"If those conversations with Putin or with other world leaders are sequestered in that same electronic file that is meant for covert action, not meant for this, if there's an effort to hide those and cover those up, yes, we're determined to find out," he added.

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A whistleblower complaint alleges the Trump administration put a conversation Trump had with Ukrainian president Volodymyr Zelensky on a highly classified server. A partial transcript of the call shows Trump asking Zelensky 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, a 2020 Democratic candidate, and his son.

The House launched an impeachment inquiry into Trump last week after the new allegations over the call with Ukraine emerged.

Trump has defended the call, saying there was nothing inappropriate about it.