If Republicans keep the House majority, that would give the party control of all three branches of government after the GOP won control of the U.S. Senate and Donald Trump won the presidential election.

More than a week after Election Day, control of the House of Representatives has yet to be decided. Out of the 435 seats in Congress’s lower chamber, 12 have yet to be called. How many of these seats — most of them concentrated in slower-counting Western states such as California and Arizona — does each party need for a 218-seat majority?

It marks a huge boost for President-elect Donald Trump as he seeks to enact his agenda, after Republicans also won control of the Senate last week.