A U.S. Supreme Court transformed by Donald Trump now sits as one of the few potential checks on his authority as he returns to the White House.

The president-elect has vowed to impose a 10% to 20% tariff on all imported goods, execute a mass deportation of undocumented immigrants and undo what the court left of Joe Biden’s environmental initiatives. But Trump hasn’t always got his way and he may need the court’s help to fulfill those ambitions.