Three protesters have been told that they can move ahead with lawsuits against President Trump's election campaign, and two Trump supporters, after they were attacked last year.

US District Judge David Hale ruled out the notion that the attackers, including one white nationalist, were Trump's agents. Hale said it's 'plausible' the would-be president incited a riot.

"At this early stage of the case, the court finds most of the plaintiffs' claims to be sufficient," Hale ruled.

There were violent scenes at a number of Trump rallies in the run up to the election.

Kashiya Nwanguma, Molly Shah and Henry Brousseau attended a rally on 1 March, 2016 in Louisville, Kentucky, for the purpose of "peacefully protesting Trump," the ruling says.

Nwanguma was carrying a sign with Trump's head on a pig's body, according to multiple news reports.

The ruling stated that Trump said: "Get 'em out of here" while at the Kentucky International Convention Center.

Matthew Heimbach, who was representing the white nationalist Traditionalist Workers Party, and Alvin Bamberger attacked the protesters, according to the ruling.

Nwanguma, Shah and Brousseau accuse Heimbach and Bamberger of assault.

They also further extra charges of incitement to riot, negligence, gross negligence and recklessness against the Trump campaign.

The claims arise from the allegations that Trump knew his supporters would attack protesters.

The three seek compensatory damages.

Bamberger, who wore a Korean War Veterans Association uniform at the rally, later conceded in a letter to the group that he "pushed a young woman down the aisle toward the exit," the court ruling states.

Although it wasn't mentioned in the ruling, Bamberger also said, in the letter, that he sincerely regretted pushing the woman.