President Trump lambasted Democrat Senator Richard Blumenthal in a single Saturday afternoon Twitter post. The tweet came as Blumenthal has been a vocal opponent of Trump’s Supreme Court nominee, Judge Brett Kavanaugh.

As Blumenthal has taken the side of the woman who accused Kavanaugh of sexual misconduct, Christine Blasey Ford, and  repeatedly demanded an investigation into the allegations against Kavanaugh, the president brought up a controversial incident from Blumenthal’s own past, when he misrepresented his service in the U.S. military.

Trump tweeted:

Senator Richard Blumenthal must talk about his fraudulent service in Vietnam, where for 12 years he told the people of Connecticut, as their Attorney General, that he was a great Marine War Hero. Talked about his many battles of near death, but was never in Vietnam. Total Phony!

This isn’t the first time President Trump has brought up Blumenthal’s military history. He also tweeted about it on February 9, 2017, during the confirmation process for another Supreme Court nominee, Neil Gorsuch.

Fox News reported the following details at that time:

Blumenthal received five deferments, from 1965-1970, before enlisting in the Marine Corps Reserve, though he was never sent out of the U.S. During his six years in the Reserve, Blumenthal was stationed in Washington, focusing on a slew of local projects, such as a Toys for Tots drive.

During his political career, however, Blumenthal frequently walked a precarious line, often framing his service just ambiguously enough to give the impression that he had spent time fighting in Vietnam.

“I served during the Vietnam era,” Blumenthal said in 2008. “I remember the taunts, the insults, sometimes even physical abuse.”

He told a gathering of families who were expressing support for returning American troops in 2003 that, “when we returned, we saw nothing like this.”

Blumenthal, however, crossed the line when speaking to a group of veterans in March 2008.

“We have learned something important since the days that I served in Vietnam,” he said.

During a 2010 press conference in which he was surrounded by veterans, Blumenthal claimed he had “misspoken.”

“On a few occasions, I have misspoken about my service, and I regret that and I take full responsibility,” said Blumenthal, who explained he meant to say he served “during” Vietnam, not “in” Vietnam. “But I will not allow anyone to take a few misplaced words and impugn my record of service to our country.”