WASHINGTON — If there was any doubt about whether Donald Trump meant business with his hard-line campaign pronouncements on immigration, race, terrorism and more, the president-elect went a long way to dispel them Friday with his first appointments to his national security team and at the Justice Department.

Trump’s trifecta in selecting Sen. Jeff Sessions for attorney general, retired Lt. Gen. Michael Flynn for national security adviser, and Rep. Mike Pompeo to lead the CIA sent a strong message that Americans are going to get what they voted for in electing a Republican whose campaign talk about national security matters largely toggled between tough and tougher.

There has been ongoing mystery about what to expect in a Trump presidency: Even some of Trump’s own supporters wrote off some of his more provocative campaign comments. Trump’s own policy statements have zigged and zagged depending on the audience. And his first two appointments to the White House staff — GOP Chairman Reince Priebus as chief of staff and onetime Breitbart News chief Steve Bannon as a senior adviser — sent a mixed message with the choice of an establishment figure and a flame-throwing outsider.

But Friday’s picks offered a concrete indication that Trump’s presidency may in fact be headed sharply to the right on issues of national security.

“If you believe in personnel as policy, it’s pretty clear where the arrows are pointing,” said Calvin Mackenzie, a presidential scholar at Colby College in Maine.

Princeton historian Julian Zelizer said the three choices all represent conservative figures with track records in government, not “wildly out-of-the-box people who don’t even come from the world of politics.”

“That’s a message not just about him following through on his campaign promises, but it’s about partisanship,” said Zelizer. “He’s giving a signal to the Republicans to stick with him because he’ll deliver.”

Trump still has plenty of big appointments yet to make, including secretary of state, that could telegraph other directions. And Congress, too, will have a say in setting national security policy.

Trump’s three latest all have sharply differed with Obama administration policy. Sessions, the Alabama senator and former federal prosecutor, is known for his tough stance on immigration enforcement. He’s questioned whether terrorism suspects should get the protection of the U.S. court system, opposes closing the detention center at Guantanamo Bay, and has highlighted concerns about voting fraud.

Pompeo, the three-term congressman from Kansas, is an outspoken opponent of the Iran nuclear deal. He has said NSA leaker Edward Snowden is a traitor and that Muslim leaders are “potentially complicit” in terrorist attacks if they do not denounce violence carried out in the name of Islam.

Flynn stepped down as director of the Defense Intelligence Agency in April 2014 and said he’d been forced out because he disagreed with Obama’s approach to combatting extremism.