His regime has also been marked by controversy over U.S. intervention in Syria, and widespread dismay at his choice of the conservative Jeff Sessions as attorney general.
Trump's first 100 days in office ends April 29, and critics have pointed out that he has yet to achieve many key goals.
Two controversial executive orders barring citizens of certain Muslim-majority countries and refugees from entering the US, for example, were blocked by federal judges amid concerns that the orders amounted to a ban on a religious group.
During the campaign, Trump promoted a "100-day action plan" he characterized as "a contract between myself and the American voter - and begins with restoring honesty and accountability, and bringing change to Washington". Those early days are typically considered a bellwether for a presidential administration and its ability to govern.
Shortly before the election, he laid out his plan for his first 100 days, including two of his biggest campaign promises: building a wall along the Mexican border and repealing the Affordable Care Act.
Presidents are often judged by how productive their first 100 days in office are, and Trump's has thus far been somewhat of a mixed bag.
Trump's travel ban, the policy version of a proposal that began during the GOP primary as a promise to ban all Muslims from entering the USA, has also stumbled out of the starting blocks. That move drew a sharp contrast between Trump and his predecessor, former President Barack Obama, who threatened action against Assad should he use chemical weapons but then did not follow through when the Syrian dictator did just that.
As the 100-day mark approaches, Trump's top press aides have said they are planning several activities to promote his progress on issues including immigration, regulatory reform and job creation.