Secretary of State Marco Rubio, fresh off his unanimous confirmation in the Senate, sent a cable to every U.S. diplomatic and consular post on Tuesday outlining his America First and “common sense” approach to diplomacy.

The former U.S. senator from Florida is President Trump’s first cabinet member to be approved by the Senate. Now at the head of Trump’s diplomatic corps, Rubio is upending what he sees as a dangerously mistaken approach to foreign policy that has dominated U.S. diplomacy for close to three decades, according to Real Clear Politics, which obtained first a copy of Rubio’s memo.

“Our department will take the lead in revitalizing alliances, strengthening ties with other partners and allies, and countering the malign activities of our adversaries. We will refocus American foreign policy on the realities of today’s reemerging great power rivalry,” the memo says.

Rubio blamed the misplaced priorities on “leaders in both political parties” who “began assuming an ever-expanding definition of the national interest prioritizing the wrong things and emphasizing ideology over common sense.”

“We have misread the world, missed key trends, and lost ground internationally,” Rubio wrote.

Key to achieving an America First State Department, Rubio wants to purge DEI policies and climate alarmism and focus his department’s efforts on U.S. national interests. Chief among those interests will be addressing mass migration and pursuing “energy dominance.”

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In the memo, Rubio called illegal immigration into the U.S. “the most consequential issue of our time.”

“This department will no longer undertake any activities that facilitate or encourage it,” he wrote. “The era of mass migration must end.”

The new secretary of State has already changed the U.S. imprint abroad. This week, he banned flags other than the American flag from being flown on State Department property. Under former President Joe Biden, State Department facilities overseas have at times flown such symbols as the gay pride and Black Lives Matter flags.

“Far too much of America’s diplomacy is focused on pushing political and cultural causes that are divisive at home and deeply unpopular abroad,” Rubio wrote in his Tuesday memo. “This creates unnecessary friction with other nations and obstructs our ability to conduct a pragmatic foreign policy and work cooperatively with other nations to advance our core national interests.”

The memo also said that the State Department will be purged of policies and agencies that have engaged “in censorship, suppression, and misinformation.” The department will stay vigilant on combatting “enemy propaganda,” he wrote, but programs that “lead or in any way open the door to censorship of the American people will be terminated.”