President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE suggested Sen. Kamala Harris Kamala HarrisJoe Biden looks to expand election battleground into Trump country Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Rush Limbaugh encourages Senate to skip hearings for Trump's SCOTUS nominee MORE (D-Calif.) got a head start over other 2020 Democratic candidates so far, saying she had the “best opening” of any of her competitors.

“I would say the best opening so far would be Kamala Harris,” Trump told The New York Times in an interview, adding that her first campaign rally got “A better crowd — better crowd, better enthusiasm.”

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“Some of the others were very flat.”

Harris’s campaign, which officially launched this week at a rally in Oakland, Calif., generated significantly more social media interest than those of her opponents, including Sens. Elizabeth Warren Elizabeth WarrenJudd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? MORE (D-Mass.) and Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.).

The Democratic primary field is expected to be one of the most crowded in modern history, with as many as 30 candidates expected to throw their hats into the ring. However, only a handful of those who would be considered front-runners have publicly expressed interest in running.

Democrats are still waiting on heavy-hitters such as former Vice President Joe Biden Joe BidenJoe Biden looks to expand election battleground into Trump country Trump puts Supreme Court fight at center of Ohio rally Special counsel investigating DeVos for potential Hatch Act violation: report MORE, Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I-Vt.), former Rep. Beto O’Rourke (D-Texas) and more to make their intentions known.

Trump campaign staffers have reportedly suggested that the president stands the best chance of reelection if he eventually faces off against Warren in 2020.

Trump attacked the Massachusetts Democrat, whom he frequently calls "Pocahontas," saying her credibility has been “hurt badly” over her controversial claims of Native American ancestry.

“I do think Elizabeth Warren’s been hurt very badly with the Pocahontas trap,” Trump said, adopting a slur to cite the scandal. “I think she’s been hurt badly. I may be wrong, but I think that was a big part of her credibility and now all of a sudden it’s gone.”

Warren announced last month she was convening an exploratory committee to look at a presidential bid. While her December declaration was soon buried in other campaign announcements, she teased Thursday another speech about her 2020 plans set for Feb. 9.