US President Donald Trump went from having 'mild symptoms' of COVID-19 to being taken to hospital with 'trouble breathing' on Saturday.
If Trump's condition worsens, who will be next in the line of succession?
1. Vice President - Mike Pence
The 48th Vice President of the United States and next in line for the Oval Office, Pence described himself as a "principled conservative" in 2020.
The Vice President is against abortion, LGBT rights and is opposed to any restrictions on assault rifles.
In 2016, Pence made Indiana the second state in the US to ban abortions. He signed the most abortion-restrictive regulation, banning abortion even in cases where the fetus has a "genetic abnormality".
Pence has also long opposed same-sex marriage. During his congressional campaign in 2000, he said: "Congress should oppose any effort to put gay and lesbian relationships on an equal legal status with heterosexual marriage."
The Vice President and his wife Karen tested negative for COVID-19 on Friday and remain "in good health," according to spokesperson Devin O'Malley.
2. Speaker of the House of Representatives - Nancy Pelosi
California Democrat Nancy Pelosi is the 52nd Speaker of the House of Representatives.
In 2007, she made history as the first woman to serve as Speaker of the House - the third most powerful role in Washington.
3. President Pro Tempore of the Senate - Chuck Grassley
Grassley is a Republican member of the US Senate from the state of Iowa - placing him third in the presidential line of succession if Trump should die or become incapacitated.
The Constitution requires the Senate to elect a President Pro Tempore to serve as a presiding officer in the absence of the Vice President.
4. Secretary of State - Mike Pompeo
Michael Pompeo has been serving as 70th United States secretary of state. He is a former United States Army officer and was the director of the Central Intelligence Agency in 2017.
5. Secretary of the Treasury - Steven Mnuchin
Steven Mnuchin has been serving as the 77th United States secretary of the treasury. Mnuchin is responsible for the US Treasury, as well as managing the US Government's finances.
