The father of one of the victims in the mass shooting at a high school in Parkland, Florida, tried to shake hands with Judge Brett Kavanaugh during the Supreme Court nominee's confirmation hearing on Tuesday in Washington.

Fred Guttenberg has been a passionate and public gun control advocate since the death of his 14-year-old daughter, Jamie, in the Feb. 14 attack on Marjory Stoneman Douglas High School by a gunman armed with a semi-automatic rifle.

Guttenberg said in a tweet that he walked up to Kavanaugh as the hearing paused for a lunch break.

"Put out my hand to introduce myself as Jaime Guttenberg's dad," he tweeted. "He pulled his hand back, turned his back to me and walked away. I guess he did not want to deal with the reality of gun violence."

Video of the encounter shows Guttenberg approach Kavanaugh, speaking to him with his arm extended. NBC News reported that Guttenberg said, "My daughter was murdered at Parkland."

Kavanaugh looks at Guttenberg for several seconds before turning away without a response, as Guttenberg's extended hand transforms into a waving finger.

A member of Kavanaugh's security team quickly stepped between the two men, as Kavanaugh walked away.

White House spokesman Raj Shah saw it differently, tweeting that "an unidentified individual" approached Kavanaugh and before the judge was "able to shake his hand, security had intervened."

He followed that up with a tweet featuring a video from a very wide angle, which he said "clearly showed that security intervened when Judge #Kavanaugh was approached."

"Incorrect," Guttenberg replied on Twitter. "I was here all day and introduced by Senator Feinstein. No security involved. He turned and walked away."

After the encounter, Capitol Police talked with Guttenberg, and were apparently satisfied with his answers because he was back in the hearing room for the afternoon session, The Associated Press reported.