When Donald Trump was elected President, it came as the Republicans kept control of both sides of Congress – meaning an easier route to pushing through any legislative agenda.

Mr Trump has proved to be combative in the run-up to him taking office, taking on China, journalists, Congressmen and women, and numerous others – primarily through the use of Twitter.

It is that combative nature that might worry some about the potential for clashes between Mr Trump and Congress over differences between the agenda of the Republican Party and the agenda of the Trump administration.

That is without the difficulty of the GOP itself between a party with its own fissures and factions – from the conservative Tea Party faction to the moderate Republicans. Many Republicans differ with Trump on issues such as free trade and worry he might be too willing to spend money that could increase budget deficits.

Mr Trump himself has appeared to potentially row back on a number of policies over the last week. The President’s administration is seen as very pro-business – particularly when it comes to simplifying things like the tax code – but Mr Trump has recently criticised a key Republican Party tax plan, known as the border adjustment tax as "too complicated".

Even more troubling for some, the main aim for a Trump presidency of repealing and replacing Barack Obama’s healthcare plan may not be as simple as it looks. The signature policy sought to extend health insurance to cover more Americans, and Mr Trump muddied the waters over a repeal this week by calling for healthcare insurance for all.

Trump Inauguration protests around the World Show all 14 1 /14 Trump Inauguration protests around the World Trump Inauguration protests around the World Activists from Greenpeace display a message reading "Mr President, walls divide. Build Bridges!" along the Berlin wall in Berlin on January 20, 2017 to coincide with the inauguration of Donald Trump as the 45th president of the United State Getty Trump Inauguration protests around the World An activist holds up a sign at the "We Stand United" rally on the eve of US President-elect Donald Trump's inauguration outside Trump International Hotel and Tower in New York on January 19, 2017 in New York Getty Trump Inauguration protests around the World Protesters burn a U.S. flag and a mock flag with pictures of U.S. President-elect Donald Trump outside the U.S. embassy in metro Manila, Philippines Getty Trump Inauguration protests around the World Filipino protestors hold placcards during a protest rally in front of the US embassy in Manila, Philippines, 20 January 2017. On the eve of President-elect Donald Trump's inaguration as the 45th president of the United States, Filipinos and Fil-Americans held a protest in front of the US embassy in Manila to denounce the incoming US president. Getty Trump Inauguration protests around the World Hong Kong police officers and security guards look on as an anarchist protester belonging to the Disrupt J20 movement sits after using a heavy duty D-lock and motorcycle lock to chain himself to a railing at the entrance gate to the Consulate General of the United States of America in Hong Kong to protest the inauguration of United States President-elect Donald Trump, Hong Kong, China, 20 January 2017. Two activists were arrested and taken away by Hong Kong police during the demonstration. Getty Trump Inauguration protests around the World A banner is unfurled on London's Tower Bridge, organised by Bridges Not Walls - a partnership between grassroots activists and campaigners working on a range of issues, formed in the wake of Donald Trump's election, which aims to build bridges to a world free from hatred and oppression. Getty Trump Inauguration protests around the World Protesters chain themselves to an entry point prior at the inauguration of U.S. President-elect Donald Trump in Washington, DC, U.S. Getty Trump Inauguration protests around the World Bridges Not Walls banner dropped from Molenbeek bridge in Brussels, Belgium, 20 January 2017, in an Greenpeace action part of protests Wolrd protest in solidarity with people in the US, the day Donald Trump sworn in as the 45th President of the United States. Getty Trump Inauguration protests around the World A woman holds an anti-U.S. President-elect Donald Trump placard during a rally in Tokyo, Japan, Getty Trump Inauguration protests around the World A Palestinian protester holds a placard during a demonstration against the construction of Jewish settlements in the occupied West Bank and against US President-elect Donald Trump, on January 20, 2017, near the settlement of Maale Adumim, east of Jerusalem Getty Trump Inauguration protests around the World Banners on North Bridge in Edinburgh as part of the Bridges Not Walls protest against US President Donald Trump on the day of his inauguration Getty Trump Inauguration protests around the World Russian artist Vasily Slonov (L) and his assistant carry a life-sized cutout, which is an artwork created by Slonov and titled "Siberian Inauguration", before its presentation on the occasion of the inauguration of U.S. President-elect Donald Trump, in a street in Krasnoyarsk, Russia Getty Trump Inauguration protests around the World A woman holds a banner during a march to thank outgoing President Barack Obama and reject US President-elect Donald Trump before his inauguration at a park in Tokyo, Japan, 20 January 2017. EPA Trump Inauguration protests around the World Palestinian demonstrators protesting this week against a promise by Donald Trump to re-locate the US embassy to Jerusalem Reuters

The key to keeping such utterances from causing major problems may end up being the Vice President Mike Pence. He has been placed at the centre of the legislative agenda for Mr Trump’s team – in a way that few Vice Presidents have.

In Mr Trump's first 100 days in office, Mr Pence will be “leading the charge” on a number of initiatives in Congress, such as rewriting Obamacare, senior Trump adviser Kellyanne Conway told Reuters.

“He has the assurance and the green light to do so from President Trump,” Ms Conway said.

“He is a major part of every serious conversation and important decision that is made, especially when it comes to the legislative agenda,” she added.

Mr Pence is seen by many on Capitol Hill as being affable and that could work to his advantage. But it won’t remove all his issues. The fact that the calm Mr Pence and the more dynamic – to put it mildly – Mr Trump are such different characters could mean that many of the people negotiating with Mr Pence may not believe completely that he speaks for the President.

There is also the fact that Mr Pence's stance on many issues has raised the ire of Democrats – particularly his anti-abortion rhetoric, his work against gay rights, his opposition to measures aimed at women’s pay equity in the workplace and his determination to repeal Obamacare.

If Republicans in the House of Representatives can rally around Mr Trump's agenda, Democrats will have few tools to block them.

But in the Senate, Democrats can use procedural moves to stop legislation that does not otherwise have support from 60 senators. Republicans control 52 votes in the 100-member chamber.

Beyond the Democrats, Mr Pence will have to smooth over some feelings of Republicans that Mr Trump took aim at during his campaign. It is useful that he has such a good relationship with Paul Ryan, the Speaker of the House, whom Mr Trump clashed with repeatedly on the campaign trial.