The mother of one of the children killed in the 2012 mass shooting at Sandy Hook Elementary School tore into President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE for hosting National Rifle Association (NRA) president Wayne LaPierre at the White House on the fifth anniversary of the massacre.

Nicole Hockley, whose son Dylan Hockley was one of 20 children killed in the shooting, slammed both Trump and White House press secretary Sarah Huckabee Sanders for their actions on the anniversary of the shooting in a lengthy Facebook post.

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Hockley first criticized Sanders for saying she didn’t think any action could have been taken to prevent the shooting.

“But while I can forgive Sanders for her lack of knowledge (though not her lack of compassion) I cannot say the same for President Trump,” Hockley wrote.

“Not only did he ignore the 5-year remembrance completely - not even a single tweet - he slapped us all in the face by having none other than NRA President Wayne LaPierre at his White House Christmas party that night. The appalling lack of humanity and decency has not gone unnoticed.”

Sanders confirmed to the New York Daily News that LaPierre was among the guests at the White House Christmas party on Dec. 14.

“While they ignorantly partied and remained uninformed on an issue that kills thousands of Americans every year, I was crying myself to sleep. While they got the chance to kiss their children goodnight, I kissed the urn holding my beautiful boy's ashes,” Hockley wrote.

“I would request an apology. But I'm not sure there are any hearts in the White House that would understand why an apology is the least they could do.”

Trump was endorsed by the NRA and figures from the group spoke at the Republican National Convention in his favor.

Trump’s White House has pushed back against taking action on gun control, with Sanders saying it was too early to take action in the days after the October mass shooting in Las Vegas, the deadliest in modern U.S. history.