Donald Trump, the former President of the United States, is in a strong position to re-claim the Republican nomination in March but must first win a legal battle to be voted for in both Maine and Colorado, a US correspondent has explained.

Both states deemed the former president ineligible to run but Trump's legal team is challenging the decisions both in Maine and the US Supreme Court - which consists of judges appointed by Trump when he was in office.

Talking to Newstalk ZB's Summer Breakfast this morning, Newshub US correspondent Mitch McCann laid out the story behind Trump's push to return to power after losing the 2020 election to Joe Biden.

Numerous polls have indicated Trump's support is rapidly growing, McCann said, with suggestions the public isn't happy with Biden's administration and wants to see change - but voters in Colorado and Maine won't be able to mark their ballot for Trump as it currently stands.

It began on December 28, when the Secretary of State in Maine decided to remove Trump from the voting ballot.

"She decided in her view that Trump had violated the Fourteenth Amendment of the Constitution and that he engaged in an insurrection with the Capitol riots back in 2021," said McCann.

"For that reason, she said, he couldn't run. But then, in the last 24 hours, Trump's legal team appealed this to the Supreme Court, which they hope will overturn the decision so that people in Maine can vote for Trump in the Republican primary in March."

Trump's legal team argued that the secretary's decision was "infected with bias", a claim they based on the fact the secretary has democratic allegiance, McCann said.

"[They believe] it's in her interests to have a Democrat win the presidential nomination and that Trump should be kept away at all costs."

McCann said part of the reason Trump is so upset by the decision made in Maine is due to his growing success in polls across the nation.

"In fact, if the election was to be held today, there's a chance Trump could win and beat Joe Biden," said McCann.

"That's because he's leading in polls in many swing states. But you have to remember the presidential election isn't until November, so there's 11 months between now and then and a lot could change."

Among the possible things that could change his fortune would be the outcome of the Maine decision, which needs to be confirmed in the next couple of weeks to allow people time to vote in the Republican primary.

However, the more pressing matter, according to McCann, is the Colorado situation - which saw the state's Supreme Court step in and remove Trump's name from the voting ballot.

Trump is expected to appeal this decision, too, as early as this afternoon, with the appeal to be made to the United States Supreme Court in Washington DC.

This move could be significant in respect to his wider presidential campaign, as the Supreme Court's decision could sway other swing states to remove Trump's name from contention if the court determined that Colorado was in the right.

"It's likely to put on hold numerous challenges in states across the country, with the highest court in America possibly to decide for all of them if Donald Trump can run for president," said McCann.

"Trump does have a couple of things in his favour - in fact, he nominated three of the conservative justices in the Supreme Court and there is a conservative majority on the court as well - so Trump might have some success there."

McCann said it would be a monumental decision for the Supreme Court not to back Trump and not allow him to run in Colorado, due to the repercussions it would have on other states voting for his re-election.

Asked how the US public was responding to the news of Trump fighting to receive votes in all 50 states, McCann said it depended largely on who you spoke to.

"I live in New York, which is quite a Democratic state - most people here don't want to see Trump in the White House ever again," he said.

"But I'm heading to somewhere like Iowa in the coming weeks where there is strong support for Trump and I think people have to realise there are millions and millions of people here who want Trump back in the White House."

The polls don't look favourable for President Joe Biden, whose approval rating currently sits at only 37 per cent. Many are unhappy with his leadership, McCann said, and look to Trump as a possible solution to their problems.

"Some Republicans are trying to nip at the heels of Trump," he said.

"But he really is so far ahead of everyone else in the Republican polls that if he does get through the court cases unscathed, which remains to be seen, he could be the Republican nominee in a matter of months."