WASHINGTON — A prominent Washington law firm targeted by President Donald Trump has sued to block an executive order that threatens its federal contracts and the security clearances of its employees.

Jenner & Block said Friday that the executive order is unconstitutional and that it expects to “prevail quickly.” The order is one in a series of White House decrees over the last month meant to punish the legal community.

The firm said it had no interest in “capitulating to unconstitutional government coercion,” a perhaps veiled reference to a deal struck last week with the White House by another targeted firm.