Rep. Eric Swalwell (Calif.), a top Democrat on the House Intelligence Committee, says the panel may need to call on President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE himself to testify on newly surfaced emails detailing a Trump Tower real estate plan for Moscow that was scrapped during Trump's 2016 presidential campaign.

Swalwell told Yahoo News that the House Intelligence Committee needed to seek testimony from Felix Sater, a Russian-born developer and Trump associate, as well as Trump.

“This is a bright light in an ever-growing constellation of contacts between Donald Trump and Russia,” Swalwell said of the new reports of a Trump Tower in Moscow.

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Trump’s company and investors signed a letter of intent to open up a massive development as part of the Trump brand but dropped the deal in January 2016 after they failed to get the land and permits to launch the project, The Washington Post reported Sunday.

Sater had reportedly also encouraged Trump to visit Moscow to hear about the proposal and promised he could get Russian President Vladimir Putin to say “great things” about Trump, according to the Post.

Developers first began discussing a deal in 2015, but it's unclear if Trump was aware of the negotiations.

The report comes amid an ongoing federal probe led by special counsel Robert Mueller into possible collusion between members of Trump's team and Russia's efforts to influence the presidential election.

Swalwell said Tuesday that Sater is a “relevant witness” who could have been a “pivotal player” between the Trump campaign and the Russian government. He told Yahoo News that Trump is also a relevant witness.

“We don’t want to be reckless,” Swalwell told Yahoo. “But that should be on the table. My belief is we have to hear from all relevant witnesses, and it does look like he [Trump] is likely relevant.”