There have been calls for President Donald Trump's impeachment ever since he took office in late January. However, the process of presidential impeachment is lengthy and complicated, and there are questions as to what happens to the presidency if the person elected to the office is removed.

Luckily, there's an official system set up in case a president is officially relieved of his duties that establishes a line of succession, and the Presidential Succession Act of 1947 as well as the 25th Amendment spell out the order of that succession, which goes from the vice president to congressional leadership and then members of Trump's Cabinet.

Who are the first five people in the line of succession should Trump be unable to fulfill his duties in the role of president? Here's what you need to know about the views and values of those in line for the presidency.

1. Mike Pence, Vice President

Before becoming vice president, Republican Mike Pence served as a U.S. representative for Indiana's second congressional district from 2001 to 2003 and the state's sixth congressional district from 2003 to 2013 before being elected the governor of Indiana, a position he held from 2013 to 2017.

Pence is antichoice in his views on women's reproductive rights and has sponsored bills to stop Planned Parenthood from receiving federal funding. In addition, he has opposed same-sex marriage, voted against raising the minimum wage, and opposed the Lilly Ledbetter Fair Pay Act, which helps women and minorities earn fair wages.

He has also been accused of being a supporter of conversion therapy to "change" a person's sexual behavior, but he denied this claim via a spokesperson to The New York Times.

2. Paul Ryan, Speaker of the House

Republican Paul Ryan was elected to the U.S. House of Representatives in 1998 to serve Wisconsin's first congressional district and became Speaker of the House in 2015; he was also the vice presidential running mate of Mitt Romney during the 2012 presidential election. The New York Times once called Ryan "proudly, conservatively ideological" as well as "religiously conservative."

In the past, Ryan has come out against all abortions, even in cases of rape, incest, or danger to a mother's health, according to the Daily Beast. He supported bans on same-sex marriage and is against gun control legislation. More recently, Ryan has been one of the main supporters of the Republican-sponsored American Health Care Act, a replacement for Obamacare.

3. Orrin Hatch, President Pro Tempore of the Senate

Republican Orrin Hatch was elected to the U.S. Senate representing the state of Utah in 1976. He became the president pro tempore in 2015; in this role, he presides over the Senate when the vice president is unable to do so.

Hatch doesn't support same-sex marriage, though he reportedly advocated for same-sex civil unions with similar rights to those in traditional marriage. He opposed Trump's initial Muslim ban, specifically critiquing how many people who weren't threats to the country would have problems receiving visas under Trump's order. He considers himself a strong advocate of religious freedom, and he once wrote that Democratic presidential nominee Hillary Clinton was "no friend of religious liberty."