Democratic lawmakers read Donald Trump Jr.'s emails regarding a 2016 meeting with a Russian lawyer on the House floor Friday, calling them a "smoking gun" in the probe into Russia's meddling in the 2016 presidential election, including any possible collusion between the Trump campaign and Russia.

Reps. Ruben Gallego (D-Ariz.) and Ted Lieu (D-Calif.) read the emails aloud on the House floor, slamming Trump Jr. for taking a meeting with the lawyer in an effort to gather damaging information on Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE during the presidential race.

"Don Jr.'s emails are a smoking gun," Gallego asserted. "They prove that the Trump campaign was not only aware of the Russian government's efforts to meddle in our elections, they were enthusiastic about accepting Russian support."

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Gallego said the emails "paint a disturbing picture of a campaign, and now an administration, willing to break the law and sell out to an adversary of the United States in order to advance their own petty interests."

Gallego urged Americans to think about President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's "fitness" for office in light of the emails.

The two Democrats brought with them a large poster board to the House floor featuring a Time magazine cover from this week, which has the words "Red Handed" printed underneath Trump Jr.'s face.

The president's eldest son released an email chain Tuesday showing his correspondence with an entertainment publicist setting up the meeting with Russian lawyer Natalia Veselnitskaya, who he was told had damaging information on Clinton.

Trump Jr. was told in the emails that the source had "sensitive information" that was "part of Russia and its government's support for Mr. Trump." He responded in one email, “If it's what you say I love it especially later in the summer.”

Gallego argued that the email shows that the younger Trump "lacks basic integrity."

Rep. Dana Rohrabacher (R-Calif.) took to the floor afterwards, saying that the Democratic lawmakers were using "sinister sounding descriptions" of Trump Jr.'s contacts with Russia.