The Senate Intelligence Committee’s investigation into alleged Russian meddling in the 2016 presidential election is set to include testimony from the intelligence community’s top cyber experts.

In the first major piece of testimony on Capitol Hill since the election, Sen. Richard Burr, R-N.C., will be joined by FBI Director Christopher Wray, former National Security Agency Director Mike Rogers and former CIA Director Mike Pompeo.

The panel is expected to deliver its findings to Burr and Rogers by the end of the week, but Burr said he doesn’t expect a full release until early next year.

Burr said there is “not a single piece” of evidence that he believes proves Russian hacking was intentional.

The committee is also expected to hear from former FBI Director Robert Mueller, who left the bureau in the last few weeks.

Burr said he expects to find evidence that Russian hackers used the WikiLeaks dump of thousands of emails to try to influence the election and, if proven, help Trump win the White House.

Burrill also said he is “very concerned” about Russian interference in the presidential election and whether it was influenced by Trump and his campaign associates.

“I believe the Russians interfered in the election in a way that helped Donald Trump,” Burr said.

“If they did that, that would be a crime.

That’s why we need to get to the bottom of it.”

The committee’s investigators are currently in charge of examining whether the Trump campaign coordinated with Russia in order to sway the election.

Burr has called the investigation a “top priority.”