Rep. Jackie Speier (D-Calif.) on Wednesday suggested Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE Jr. had more undisclosed interactions with Russian agents, calling the revelations of his meeting with a Russian lawyer during the presidential campaign the "tip of the iceberg."

"I believe there was probably a phone conversation that Donald Trump Jr. had with someone before the actual meeting took place," Speier, who serves on the House Intelligence Committee, told MSNBC.

"And then there was clearly a message being sent by the Russians that 'we want to help your father out, we want to help Trump get elected to the presidency.' "

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Speier called the first meeting just the "tip of the iceberg," adding that it's crucial to find out about any other interactions.

Trump Jr. last week released a chain of emails showing how his meeting with Russian lawyer Natalia Veselnitskaya was set up in June 2016.

In one of the emails, Rob Goldstone, a music promoter who arranged the meeting, told Trump Jr. that a chief prosecutor in Russia met with a business associate of then-candidate Donald Trump and offered "information that would incriminate Hillary" Clinton and her "dealings with Russia."

Goldstone described it as "obviously very high level and sensitive information," and wrote that it "is part of Russia and its government's support for Mr. Trump." Trump Jr. replied, in part, "if it's what you say I love it."

But Trump Jr. has said that the lawyer offered no damaging information on Clinton during the meeting.

He has also argued that there was nothing unusual in his meeting with someone offering negative information on a political opponent, though in an interview with Fox News he acknowledged that in retrospect he wishes he had done some things differently.

Democrats have slammed the meeting, calling it a smoking gun proving that the Trump campaign colluded with Russia during the 2016 presidential campaign.

Trump Jr. and former Trump campaign chairman Paul Manafort are slated to testify before the Senate Judiciary Committee in a public hearing next week.