President Trump is on vacation, but that hasn’t stopped him from watching early morning cable TV and tweeting angrily in response.

On Monday, President Trump went after Connecticut Sen. Richard Blumenthal, who was on CNN earlier in the morning to discuss the ongoing investigation into possible collusion between the Trump campaign and Russian government.

Blumenthal also expressed concern that the Trump administration has “weaponized” investigations into leaks of classified information. On Friday, Attorney General Jeff Sessions announced that the agency will be aggressively investigating leaks to the media.

Blumenthal’s remarks touched off a trio of tweets from Trump, who began his vacation at his Bedminster, N.J. golf resort on Friday.

Interesting to watch Senator Richard Blumenthal of Connecticut talking about hoax Russian collusion when he was a phony Vietnam con artist! — Donald J. Trump (@realDonaldTrump) August 7, 2017

Never in U.S.history has anyone lied or defrauded voters like Senator Richard Blumenthal. He told stories about his Vietnam battles and…. — Donald J. Trump (@realDonaldTrump) August 7, 2017

…conquests, how brave he was, and it was all a lie. He cried like a baby and begged for forgiveness like a child. Now he judges collusion? — Donald J. Trump (@realDonaldTrump) August 7, 2017

In 2010, The New York Times reported that Blumenthal falsely claimed that he served in the Vietnam War. In fact, Blumenthal served in the U.S. Marine Corps Reserve between 1970 and 1976, but he was stationed in the U.S. and never went to Vietnam. He had received five deferments between 1965 and 1970.

Blumenthal said after the Times revelation that he “misspoke” about being in Vietnam.

Trump himself received four student deferments and one medical deferment, preventing him from being drafted. But unlike Blumenthal, Trump has never claimed to have served in Vietnam.

Trump has gone after Blumenthal about his Vietnam statements in the past.

In February, after Blumenthal pledged to block Trump’s Supreme Court nominee Neil Gorsuch, Trump criticized CNN anchor Chris Cuomo for not asking Blumenthal about his Vietnam record.

Chris Cuomo, in his interview with Sen. Blumenthal, never asked him about his long-term lie about his brave "service" in Vietnam. FAKE NEWS! — Donald J. Trump (@realDonaldTrump) February 9, 2017