Sen. Richard Blumenthal (D-Conn.) said Thursday it is "significant" that a data research firm tied to the Trump campaign reportedly reached out to WikiLeaks founder Julian Assange during the 2016 election.

"It is significant because it demonstrates evidence of potential collusion between the Trump campaign and the Russian interference," Blumenthal told CNN's Anderson Cooper.

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"Here we have more evidence of a pattern that has been established of collusion and perhaps of obstruction of justice," Blumenthal continued, referring to the president's repeated claims that probes into alleged collusion are a "hoax."

Blumenthal's comments come after The Daily Beast reported Wednesday that the head of Cambridge Analytica, which was affiliated with the Trump campaign, contacted Assange about finding former Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE's missing emails.

Assange confirmed in a tweet Wednesday that WikiLeaks was approached by the firm.

I can confirm an approach by Cambridge Analytica [prior to November last year] and can confirm that it was rejected by WikiLeaks. — Julian Assange (@JulianAssange) October 25, 2017

Rep. Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (Md.), the top Democrat on the House Oversight and Government Reform Committee, and Rep. John Conyers John James ConyersBiden's immigration plan has serious problems Tlaib wins Michigan Democratic primary Tlaib holds lead in early vote count against primary challenger MORE Jr. (Mich.), the top Democrat on the House Judiciary Committee, announced Thursday they sent a letter to various former consultants for the Trump campaign to look into whether they colluded with the Russians in their attempts to influence the election.

Cambridge Analytica is among the companies included in the letter, as well as Giles-Parscale, TargetPoint Consulting, The Data Trust and Deep Root Analytics.

"As we assess legislation that addresses whether American businesses directly engaged with known hostile foreign actors such as Wikileaks, cooperated with foreign governments, or used misappropriated data, it is important we understand what happened," Cummings and Conyers wrote.

The Trump campaign operation appeared to distance itself from the data mining firm Wednesday after the report that its leader sought contact with Assange. Trump campaign aide Michael Glassner said in a statement that the 2016 campaign relied on the Republican National Committee and its data experts “as our main source for data analytics.”