Bill and Hillary Clinton
Bill Clinton stands behind Hillary as she addresses supporters at the New Yorker Hotel Getty

Former US president Bill Clinton told reporters he'd "never cast a vote I was prouder of" after casting his electoral college ballot for his wife, Hillary on Monday. Clinton is an elector in his home state of New York, where he and Hillary reside in Chappaqua.

Hillary Clinton won New York state in November's presidential election and with it the state's 29 electoral college votes. Even with a few other large states backing her, Clinton was beaten by her Republican rival, Donald Trump, who triumphed with 306 votes.

As reported by CBS, Bill Clinton cast his vote for Hillary and then spoke to reporters about how she had "fought through everything" but "couldn't prevail against" Russian hacking and FBI director James Comey's letter.

"You know, I've watched her work for two years. I watched her battle through that bogus email deal, be vindicated at the end when Secretary Powell came out. She fought through that," Clinton said,

"She fought through everything. And she prevailed against it all but at the end we had the Russians and the FBI deal and she couldn't prevail against them. She did everything else and still won by 2.8 million votes."

Despite a few defections on both sides, the electoral voting on Monday easily elected Donald Trump to be the next US president. Four electors in Washington state, who were supposed to vote for Hillary Clinton, flipped — three voting for former US Secretary of State Colin Powell, and one for Native American leader Faith Spotted Eagle.

In Texas, two electors rebelled and voted against Trump, one voting for former Texas congressman Ron Paul and one for Ohio Governor and Republican primaries contender John Kasich.

On being formally elected, Donald Trump released a statement calling it a "historic electoral landslide victory" and thanking the American people for their "overwhelming vote". Though Trump won the electoral college, he still trails Hillary Clinton in the popular vote by almost three million votes.