Hillary ClintonHillary Diane Rodham ClintonThorny part of obstruction of justice is proving intent, that's a job for Congress Nadler: I don't understand why Mueller didn't charge Donald Trump Jr., others in Trump Tower meeting Kellyanne Conway: Mueller didn't need to use the word 'exoneration' in report MORE offered one of her most direct rebukes of President TrumpDonald John TrumpThorny part of obstruction of justice is proving intent, that's a job for Congress Obama condemns attacks in Sri Lanka as 'an attack on humanity' Schiff rips Conway's 'display of alternative facts' on Russian election interference MORE in months on Thursday after Trump accused her of colluding with Russia during the 2016 presidential election at his campaign rally in Pennsylvania Wednesday night.

At the rally Wednesday night, Trump told an arena of supporters that there was "collusion between Hillary, the Democrats and Russia" during the 2016 election, despite offering no evidence for his claim. An intelligence community assessment in 2017 concluded that Russia's efforts were aimed at undermining the Clinton campaign.

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"There was a lot of collusion with them and Russia and lots of other people," Trump added during the rally.

"Seriously, you asked Russia to hack me on national television," Clinton responded in a tweet Thursday afternoon.

Clinton's message referred to the president's comments at a news conference on the campaign trail in 2016, where he appeared to call on Russia directly to find emails supposedly deleted from Clinton's private email server used during her time at the State Department.

“Russia, if you’re listening, I hope you’re able to find the 30,000 emails that are missing,” Trump said at the time, adding: “I think you will probably be rewarded mightily by our press.”

The president has accused his former opponent of collusion with Russians before. In April, Trump quoted a Washington Post columnist who alleged that Clinton had sought compromising information on Trump from Russian sources during the campaign, which fact-checkers have found to be false.

"We already have a smoking gun about a campaign getting dirt on their opponent, it was Hillary Clinton," Trump tweeted at the time, quoting the writer. "How is it OK for Hillary Clinton to proactively seek dirt from the Russians but the Trump campaign met at the Russians request and that is bad?”

Trump's eldest son, Donald Trump Jr.Donald (Don) John TrumpNadler: I don't understand why Mueller didn't charge Donald Trump Jr., others in Trump Tower meeting Impeachment? Not so fast without missing element of criminal intent House Dem calls on lawmakers to 'insulate' election process following Mueller report MORE, responded to Clinton in his own tweet Thursday afternoon, accusing the Clinton campaign of consorting with "foreign agents" to fund the creation of Christopher Steele's unverified dossier of allegations about Trump's ties to Russia.

"You should really sit this one out," he added.