However, a number of high-profile American politicians have claimed that violating the Withdrawal Agreement will prevent Britain from signing a new trade deal with America.
They argue that the agreement is necessary to safeguard peace in Northern Ireland.
Dominic Raab spoke with President Nancy Pelosi
Dominic Raab is in Washington DC to meet with US political leaders
Mr. Raab met with Ms. Pelosi and Richard Neal, chairman of the powerful Congress Ways and Means Committee, on Tuesday.
At the end of the meeting, Ms Pelosi issued a statement warning Britain not to violate “its international agreements”.
She said: ‘In our meeting today with the Foreign Secretary, President Richie Neal and I welcomed his assurances, but reiterated the same message we conveyed to UK leaders in London Last year.
“If the UK violates its international agreements and Brexit undermines the Good Friday deal, there will be absolutely no chance that a trade deal between the US and UK will be passed by Congress .
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Dominic Raab with US Secretary of State Mike Pompeo
“The Good Friday Agreement is enjoyed by the American people and will continue to be proudly defended in the United States Congress.”
Democrats have a majority in the House of Representatives, which means they could potentially block any trade deal between the UK and the US.
Under the Brexit withdrawal agreement, Northern Ireland will remain closely linked to the European single market, when the transition period to leave the EU ends at the end of this year.
This is to avoid a hard border between Northern Ireland and the Republic of Ireland, which could undermine the peace agreement.
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Nancy Pelosi warned the government not to undermine the peace in Northern Ireland
An anti-Brexit protester outside Parliament on Wednesday
However, this does mean Britain should put in place checks on good travel between Northern Ireland and the rest of the UK.
The government argues that this is an unacceptable attack on British sovereignty and needs to be amended.
Before meeting Mr. Raab, Ms. Pelosi explained her position in a statement.
She commented: “The Good Friday Agreement is the foundation for peace in Northern Ireland and a beacon of hope for peace-loving people around the world.
“Whatever its form, Brexit cannot be allowed to jeopardize the Good Friday deal – the stability brought about by the transparent border between the Republic of Ireland and Northern Ireland.”
Following pressure from some conservative backbenchers, the government agreed to amend the Domestic Markets Bill so that parliamentary approval is required for its more controversial aspects to become law.
Last week, the Secretary of Northern Ireland admitted that the new legislation “violates international law” in a “specific and limited way”.
Government claims parts of withdrawal agreement undermine British sovereignty
US Democratic Party presidential candidate Joe Biden also warned that any new trade deal between the UK and the US would be “contingent” on compliance with the Good Friday deal.
Mr Biden will seek to take over President Donald Trump in the November 3 election.
However, Mike Pompeo, secretary of state in the Trump administration, said of Northern Ireland that he trusted Britain to “get it right.”