President Donald J. Trump tweeted on Monday morning that airport delays over the weekend were caused by a computer outage at Delta Airlines (DAL), protesters, and the “tears of Senator Schumer.”

Trump’s decision to sign an executive order on Friday that temporarily bans individuals from seven Muslim-majority countries — Syria, Sudan, Yemen, Iran, Iraq, Libya, and Somalia — from entering the United States sparked protests at major airports nationwide over the weekend. The executive order also temporarily suspends refugees from entering the US.

On Sunday, Delta experienced a system outage that caused 170 flights to be canceled. The airline said in a statement on Monday that another 110 flights had been canceled due to the IT system outage.

“I want to apologize to all of our customers who have been impacted by this frustrating situation,” Delta’s CEO Ed Bastian said in a statement. “This type of disruption is not acceptable to the Delta family, which prides itself on reliability and customer service. I also want to thank our employees who are working tirelessly to accommodate our customers.”

Senator Chuck Schumer (D-NY) teared up during a press conference in New York City as he addressed the immigration ban, calling it “mean-spirited” and “un-American.”

Shares of Delta Airlines were down by 0.6% in pre-market trading on Monday.

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Julia La Roche is a finance reporter at Yahoo Finance. Follow her on Twitter.

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