The U.S. House of Representatives will vote on Tuesday on a resolution aimed at stopping President Donald Trump’s declaration of a national emergency to build a wall on the border with Mexico, Speaker Nancy Pelosi said on Friday, Reuters reported.

House Democrats introduced the resolution early on Friday, taking the first step to challenge Republican Trump’s assertion that he could take money Congress had appropriated for other activities and use it to build the wall.

Pelosi predicted the resolution would pass the Democratic-controlled House. Action would then move to the Republican-majority Senate, where the measure’s future is less clear.

About 226 House lawmakers have joined the sponsor, Democratic U.S. Representative Joaquin Castro of Texas, in backing the legislation. The co-sponsors so far include one Republican, Representative Justin Amash of Michigan, Castro said.

“What the president is attempting is an unconstitutional power grab,” Castro said in a conference call with reporters. He called on all members of Congress — Democrats and Republicans — to support the resolution terminating Trump’s emergency declaration, saying it tramples on congressional authority and would set a dangerous precedent.