Madison: The Wisconsin Supreme Court has rejected US President Donald Trump’s lawsuit attempting to overturn his loss to Democrat Joe Biden in the battleground state, ending Trump's legal challenges in state court about an hour before the Electoral College was to meet to cast the state's 10 votes for Biden.

The court held arguments in the case on Saturday, the same day a federal judge dismissed another Trump lawsuit seeking to overturn his loss in Wisconsin. Trump appealed that ruling.

The President sought to have more than 221,000 ballots disqualified in Dane and Milwaukee counties, the state's two most heavily Democratic counties. In a 4-3 ruling, Justice Brian Hagedorn, a conservative writing for the majority, said the Trump campaign was “not entitled to the relief it seeks”.

Hagedorn used a sports analogy when ruling against Trump, saying he waited too long to raise his complaints.