Ivanka Trump tweeted Monday all worship and religious centers must be protected after 11 Jewish community centers across the country received bomb threats earlier in the day.
Eleven JCC's received phone-in bomb threats Monday, including centers in Chicago, Buffalo, Houston, and Tampa. All were determined to be hoaxes.
Since January, 54 Jewish community centers in 27 states have received bomb threats, a record number according to Paul Goldenberg, the national director of the Secure Community Network which advises Jewish organizations on security.
"I've been in the business for 20-plus years, and this is unprecedented," Goldenberg told CNN. "It's more methodical than meets the eye."
Ivanka Trump was the first Trump family member to comment on the threats. She and her husband, Jared Kushner, are Jewish.
"Hatred and hate-motivated violence of any kind have no place in a country founded on the promise of individual freedom," the White House said in a statement, according to an NBC News reporter.
"The President has made it abundantly clear that these actions are unacceptable."
President Donald Trump last week received backlash for answering a question about a rise in anti-Semitic attacks with comments recalling he had won 306 electoral votes in the 2016 election.
"And there's tremendous enthusiasm out there," he added.
He then said, "we are going to have peace in this country" and "we are going to stop crime in this country."