Presidential historian Douglas Brinkley said that with the Barrett nomination, the reshaping of the Supreme Court joins two other events that have already defined his first term: his impeachment and his sluggish response to the coronavirus. And since Trump hasn’t faced a major foreign policy crisis — unlike many other presidents — those issues are even more prominent.

“There’s no question that three Supreme Court justices is Donald Trump’s most tangible accomplishment,” Brinkley said. “These are appointments that will change the future of America for decades to come. It’s going to be indisputable.”

Barrett, who has served on the 7th U.S. Circuit Court of Appeals since late 2017, would replace a liberal icon, Justice Ruth Bader Ginsburg, who died last week.

Carrie Severino, president of the Judicial Crisis Network, a conservative advocacy group that has worked closely with the administration on judicial appointments, said Trump has “arguably done more than any president in memory to restore constitutionalism to the court.”