Republicans have secured the 218 seats needed for a majority in the lower chamber of Congress a week after the midterm elections.While the party’s margin in the House of Representatives is razor-thin, it is enough to stall President Joe Biden’s agenda for the next two years.But Democrats will keep control of the Senate when the new Congress convenes in January.A handful of seats remain to be called.The Republicans – who had hoped to win back control of both chambers – underperformed expectations in last week’s midterms.