President Donald Trump’s declaration of a national emergency to fund his border wall has come under withering bipartisan criticism. Whether he’s able to hold off a congressional push to block the move will soon become clear.

House Democrats are expected to pass a formal resolution of disapproval of Trump’s declaration, which would then head to the Senate floor where only a simple majority is needed for passage.

Although many GOP senators criticized Trump for declaring a national emergency, few have said whether they would break with the president. Here are some of the crucial voters to keep an eye on — a collection of more centrist Republicans and GOP incumbents who could face tough reelection bids in 2020. If four Republicans join all Democrats, Trump could impose his first veto.

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