Two members of the US Senate Judiciary Committee have moved to protect special counsel Robert Mueller from being fired by president Donald Trump.

President Barack Obama’s Democrats narrowly retained their Senate majority, losing at least six seats but beating tough challenges in key states like Nevada, West Virginia and California.

Opposition Republicans delivered a stinging blow to President Barack Obama, capturing the US House of Representatives in election results.

Opposition Republicans scored the first gains in US elections as they looked to end Democratic control of Congress and deliver a stinging blow to Barack Obama's presidency.