Donald Trump Jr.Donald (Don) John TrumpEx-state senator in North Carolina enters race against Tillis Trump remarks deepen distrust with intelligence community Trump remarks deepen distrust with intelligence community MORE took to Twitter on Sunday to troll House Intelligence Committee Chairman Adam SchiffAdam Bennett SchiffThe Hill's Morning Report - Is US weighing military action against Iran? The Hill's Morning Report - Is US weighing military action against Iran? Schiff: Intelligence agencies focused on Russian interference 'even if the president isn't' MORE (D-Calif.) hours after Attorney General William Barr delivered a summary of special counsel Robert MuellerRobert (Bob) Swan MuellerKamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump MORE’s investigation to Congress.

As lawmakers from both sides of the aisle reacted following Barr’s summary of Mueller’s lengthy investigation into collusion between the Trump campaign and Russia to interfere in the 2016 election, Trump Jr. knocked Schiff for remaining quiet.

“Has anyone heard from slimy Adam #fullofschiff Schiff today?” Trump Jr. wrote in a post on Twitter Sunday evening. “I mean it must be embarrassing to have have spent the last 2 years as the leader of the tinfoil hat brigade and have it all come crashing down so quick.”

Trump Jr. borrowed the “full of Schiff” reference from his father. President TrumpDonald John TrumpTrump says 'Failing New York Times' should be held 'fully accountable' over Russia report Trump says 'Failing New York Times' should be held 'fully accountable' over Russia report Trump tweets ICE will begin removing 'millions' of undocumented migrants MORE has consistently ripped the California lawmaker, who is leading a congressional investigation into Trump.

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Trump’s son added that he is “legitimately concerned for his mental state,” referring to Schiff.

On Sunday morning, before Barr delivered his letter to Congress, Schiff said Congress would have to consider impeaching Trump if Mueller’s report found “overwhelming evidence of criminality” on Trump's part.

According to Barr’s letter, which summarized the conclusions from Mueller’s investigation, there was no evidence of collusion between the Trump campaign and Russia to interfere in the 2016 election.

The letter says that Mueller did not make a conclusion as to whether Trump obstructed justice in the investigation of Russia's election interference, though Barr and Deputy Attorney General Rod RosensteinRod RosensteinTrump: I didn't fire Mueller since firings 'didn't work out too well' for Nixon Trump: I didn't fire Mueller since firings 'didn't work out too well' for Nixon GOP group urges Republicans to speak out on obstruction claims against Trump in new ad MORE decided they would not pursue an obstruction of justice charge against Trump.