Donald Trump not only leads the Republican presidential race, but it appears that his presence is strong in the national poll.

According to the Fox News poll conducted from Jan. 4 to Jan. 7, the real estate mogul is ahead of the former Secretary of State, Hillary Clinton, by three points at 47 percent vs. 44 percent. This is in contrast to Clinton's lead by one point in last December's poll by Rasmussen Reports.

A separate survey conducted by Mercury Analytics also revealed that almost 20 percent of Democrats would switch sides and go for Trump.

The Washington-based research firm found that, at the same time, 14 percent of Republicans would also give their support over to the opposing party and vote for Clinton.

The poll conducted from Jan. 6 to 8 also asked voters how sure they are about switching parties. About 63 percent of Democrats cited that they are 100 percent sure of voting for Trump, compared to only 39 percent Republicans who said they are 100 percent sure about going for Clinton.

The survey also asked voters how they feel about the recently released Trump campaign. About 25 percent of Democrats "agree completely" that Trump's ad had good points and only 14 percent "agree somewhat."

In addition, 21 percent "agree completely" that Trump's ad represent how the respondents feel, and 11 percent only "agree somewhat."

It appears that Clinton's support has dropped, but according to Breitbart, she still has an edge over other Republican candidates — at least against Jeb Bush. The news outlet added that Bush is the only Republican candidate who doesn't stand a chance against Clinton.

On the other hand, it doesn't mean that Trump won't face challenges. According to Mercury Analytics, Democrat voters are also strongly concerned about the business magnate's style.

The survey revealed that 66 percent Democrats, 32 percent Republicans, and 41 percent of Independents are very concerned with Trump's style and temperament.

"Mr. Trump's style today concerns and turns off many. However, the issues he raises are real to many voters, and if he gets the nomination, reduces his hyperbolic comments while remaining straight talking, and presents a smart problem-solving and successful business persona, he has the opportunity to reduce the Trump fear factor and raise his acceptability, while Hillary's negatives may be much harder to reduce," Ron Howard, the firm's CEO explained.