Thousands of pages of emails, text messages, congressional testimony and other documents released by Senate Judiciary Committee Chairman Chuck Grassley provide fresh evidence of pre-election co-ordination between Trump and Russia.
If Trump Jr agrees to appear before the judiciary committee, he would be the highest member of the president's inner circle of relatives and White House aides to testify in Congress about the Russia allegations.
Allegations of the Trump campaign's ties to Russia have cast a shadow over President Donald Trump's first five months in office.
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