Congress is determined to get access to U.S. President Donald Trump's calls with Russian President Vladimir Putin and other world leaders, the chairman of the House Intelligence Committee said on Sunday, citing concerns the Republican leader may have jeopardized national security.

"I think 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," Democrat Adam Schiff said on NBC's "Meet the Press."

Following a whistleblower complaint that Trump solicited a political favor from Ukraine's president that could help him get re-elected, the lawmakers are investigating concerns Trump's actions jeopardized national security and the integrity of U.S. elections.