The number of registered voters who "strongly disapprove" of President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE has been on the rise, according to a series of polls conducted by The Hill and HarrisX since July.

The surveys found movement among respondents who said they "strongly disapproved" of Trump, with 38 percent saying they "strongly disapproved" in July, dropping to 35 percent in August.

Trump's strong disapproval has ticked back up to 40 percent, according to the last Hill-HarrisX survey released earlier this month.

The data does demonstrate loyalty among those who say they "strongly approve" of the president, which has held in the low- to mid-20s since July.

Twenty-three percent of registered voters surveyed said in the latest poll that they "strongly approved" of Trump.

Trump's net disapproval rating has also increased, with 52 percent of those disapproving in July going up to 55 percent in February.

Meanwhile, his net approval rating was at 48 percent in July and currently sits at 45 percent, according to the latest poll.

The increase in those saying they strongly disapprove of the president could negatively impact him in 2020 as he looks to hold onto a number of states, namely Pennsylvania, Michigan and Wisconsin, that flipped from blue to red in 2016.

However, Republican pollster Chris Wilson said Trump demonstrated in 2016 that he was able to rebuild his approval ratings on a "state by state" basis.

"He started out at a net-negative in Iowa, and then he's able to move it towards a positive. He did the same in New Hampshire, and I think that's what Donald Trump is good at from a marketing perspective," Wilson, partner and chief strategist at WPA Intelligence, told Hill.TV's Krystal Ball Wednesday on "What America's Thinking."

"He can find the states, the Pennsylvanias, the Michigans, the Wisconsins, the Iowas, in which he knows he has to win. He focuses in on them, and he is able to rebound those numbers," he said.

All of the polls were conducted among statistically representative samples of about 1,000 registered voters. Each of them has a sampling margin of error of 3.1 percentage points. The full dataset is available.

— Julia Manchester