Senator Warren vows to track Trump's every move

Fiery US senator Elizabeth Warren has written an open letter to president-elect Donald Trump saying that she will be tracking every move that he makes in the Oval Office.

The Massachusetts senator has gained a reputation for attacking Wall Street banks and tackling political lobbying from corporations, and has criticised the Republican for breaking his promises to cut the influence of such organisms on the White House.

Warren pointed out the appointments to his transition team, including the courting of former Goldman Sachs chief executive Steven Mnuchin and JPMorgan Chase CEO Jamie Dimon.

"Based on public reports, your transition team and your potential cabinet include over twenty Wall Street elites, industry insiders, and lobbyists making decisions that could have huge implications for their clients or employers," Warren's letter read.

Warren made an unsuccessful attempt to gain the Democratic nomination for president, but many have touted her as a possible opponent to Trump in four years time.

"You made numerous promises to the American people in your election campaign, none bigger than the promise to ‘drain the swamp' of Washington D.C. special interests rigged against the middle clas," she continued.

"The decisions you make with your transition team will shape the next four years of this nation."

Trump's appointment of Breitbart editor Steve Bannon drew widespread criticism, as has the presence of members of the businessman's family in his transition team.

"Let me be clear. Should you refuse, I will oppose you, every step of the way, for the next four years. I will champion the millions of Americans you will fail to protect."

"I will track your every move, and I will remind Americans, every day, of the actions you take that fail them."