Sen. Mazie Hirono Mazie Keiko HironoDemocrats unveil plan declaring racism a public health issue Overnight Defense: US, Russia trade blame over Syria incident | Pentagon calls out China's 'counterproductive' military exercises, missile test | Democrats press Esper on COVID-19 response Democrats press Esper on 'concerning' rise in Pentagon's COVID-19 cases MORE (D-Hawaii) joked on Twitter Tuesday that she didn’t expect 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 son to provide evidence of the Trump campaign colluding with Russia.

“When [President Trump] said show us the evidence of collusion, I have to say, I didn't expect his son to answer,” Hirono tweeted Tuesday.

When @realDonaldTrump said show us the evidence of collusion, I have to say, I didn't expect his son to answer. https://t.co/yqzbZFkmM8 — Senator Mazie Hirono (@maziehirono) July 11, 2017

Hirono's tweet came in response to Donald Trump Jr. releasing a series of emails Tuesday that detailed his correspondence with an acquaintance as they arranged a meeting with a Russian lawyer who promised to provide damaging information about 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 as part of a Russian campaign to support President Trump.

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The acquaintance, Rob Goldstone, wrote in one email that “high level and sensitive information … is part of Russia and its government's support for Mr. Trump.”

“If it's what you say I love it,” Trump Jr. said in one email responding to the promised information.

President Trump has repeatedly denied that his campaign or members of his administration colluded with Russia to win the election, saying in May that the special counsel into Russian election interference will find no evidence of collusion.

Lawmakers running House and Senate investigations into Russian election meddling are competing to get Trump Jr. to testify before their committees, with several lawmakers criticizing Trump Jr. for the emails.