Midterm election a 'big day' for Republicans: Trump

US President Donald Trump on Wednesday hailed a "big day" for Republicans after his party lost the House of Representatives in the US midterm elections but increased their majority in the Senate.

"It was a big day yesterday, an incredible day," Trump told a news conference at the White House.

"And last night... the Republican Party defied history to expand our Senate majority while significantly beating expectations in the House.