President Donald Trump's disapproval rating is equal to that of former President Richard Nixon shortly before he resigned from office, a poll shows.

The Marist College poll showed 45 percent disapproved of the job Trump was doing. Thirteen percent said the president was doing a fair job; 20 percent said pretty good; and 20 percent said excellent.

Trump's disapproval rating is equal to that of Nixon when he resigned the presidency 44 years ago amid the Watergate scandal, CNN reported. At the time, 70 percent of Democrats said they disapproved of the job Nixon, a Republican, was doing. The recent Marist poll showed 80 percent of Democrats disapproved of Trump.

Trump's approval rating among Republicans - those who said he was doing either an excellent or pretty good job - was 85 percent. Forty-percent of independents approve of the job Trump is doing, the poll showed.

While the disapproval ratings were equal, more thought Trump was doing an excellent job, according to the poll. In the last poll taken before Nixon resigned in 1974, only 7 percent said he was doing an excellent job compared to 20 percent who said the same about Trump.

The Marist Poll was conducted July 19-22 and has a margin of error of 3.6 percentage points.