Rep. Ted Lieu (D-Calif.) rejected on Friday House Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE's (R-Wis.) response to a deadly shooting at a South Florida high school, saying that the problem that accompanies such attacks is Ryan's lack of a reaction.

"Dear @SpeakerRyan: I've been in Congress since 2015 and there have been at least 20 moments of silence on the House Floor," Lieu tweeted. "The problem isn't that anyone has a knee-jerk reaction to yet another mass shooting. The problem is that you repeatedly have NO REACTION."

Dear @SpeakerRyan: I've been in Congress since 2015 and there have been at least 20 moments of silence on the House Floor. The problem isn't that anyone has a knee-jerk reaction to yet another mass shooting. The problem is that you repeatedly have NO REACTION. #FlashbackFriday https://t.co/o3nJB9Cy4G — Ted Lieu (@tedlieu) February 16, 2018

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Lieu's comments came two days after a gunman opened fire at Marjory Stoneman Douglas High School in Parkland, Fla., about 25 miles north of Fort Lauderdale, killing 17 and injuring 14 others.

After the attack, Ryan pushed back against calls from some Democrats and activists for stricter gun control laws, saying that "this is not the time to jump to some conclusion."

"We need to think less about taking sides and fighting each other politically and just pulling together," Ryan said. "This House and the whole country stands with the Parkland community."

The accused gunman in the Parkland shooting was identified as 19-year-old Nikolas Cruz, a former student at the school. He allegedly carried out the attack with an AR-15, an assault-style semi-automatic rifle, which he purchased legally from a dealer in Coral Springs, Fla.

Cruz is charged with 17 counts of premeditated murder. He confessed on Thursday to carrying out the shooting.