Rep. Pete Sessions (R.,Texas) predicts that Republicans will win enough seats to take control of the House:

Speaking on NBC’s “Meet The Press,” the chairman of the National Republican Congressional Committee said he was confident the GOP will become the majority party in the House for the next Congress.
“I think we’re going to be slightly over 40,” Sessions told David Gregory when asked for a specific number on how many House seats Republicans will win.
That would give Republicans just enough seats to win the House. The GOP need to win 39 House seats in the fall elections to take control of the chamber.