A senior Pentagon official said the administration has “increased our force posture throughout CENTCOM.” A member of Iran’s Parliament even said Iran could attack the White House itself, according to an Iranian news agency.

Senior administration officials also have been told to be on the lookout for cyberattacks that often arrive in inboxes as suspicious emails, one of those officials said.

“I would assume there would be an increase in terms of the intelligence with respect to the White House being a potential target, but generally the security around the White House is maintained at a very high level every day,” said a former senior Secret Service official. “Cyber is obviously a potential target and trying to target the White House, the Pentagon, Congress and other targets in the Washington, D.C., area from a cyber perspective.”

Asked about the increased security around the White House campus, a Secret Service spokesperson said: “While the agency does not discuss the specifics of our protective operations, the U.S. Secret Service continuously assesses the threat environment surrounding all protectees and will adjust postures as necessary as part of the robust execution of our zero-fail mission.”

The bigger challenge now for the White House is answering tough questions from lawmakers and foreign policy hands about why the government opted to kill Iranian General Qassem Soleimani at this particular moment — as well as Trump’s plan for handling Iran’s potential retaliation. Soleimani was killed in a drone strike at the Baghdad airport early Friday Iraqi time after American officials determined he was planning attacks in the near future on Americans in Iraq, Syria and Lebanon.

“If it happens, it happens. If they do anything, there will be major retaliation,” Trump said Sunday night on Air Force One as he returned to Washington from his two-week break at Mar-a-Lago.

One Mar-a-Lago member said the president seemed like he was in a great mood on Saturday night, roughly 48 hours after the strike, shaking hands and stopping to talk with club members over dinner.