U.S. Attorney John Durham has zoomed in on his investigation into the FBI and law enforcement’ activities and handling of the Russia probe amid the impeachment inquiry led by House Democrats, following new evidence he gathered during his trip to Rome with the attorney general.

Durham, a lawyer from Connecticut, was appointed by Attorney General Bill Barr to make certain that U.S. government activities tied to the Trump 2016 presidential campaign were “lawful and appropriate.”

According to sources acquired by Fox News, Durham expressed great interest in interrogating former Director of National Intelligence James Clapper and former CIA Director John Brennan, a critic of President Trump who opposed the idea of former FBI Director James Comey’s suggestion that the Steele dossier be included in the intelligence report.

“If the rumors are true that IG Horowitz’s report and findings in Durham’s review will blast the conduct of the FBI’s Russia investigation, it will give Trump a lot of ammo to support his argument that he was unjustly targeted then and is being unjustly targeted now,” Fox News reported citing a House GOP source on Tuesday. “It will justify Trump’s warnings about the deep state acting to hobble his presidency.”

Amid fierce clashes between the GOP and the Democratic Party, Durham has proceeded modestly with his probe that could turn the tables against Trump’s harshest critics.

Justice Department spokeswoman Kerri Kupec has confirmed that Durham is well underway with the investigation.

Durham is “gathering information from numerous sources, including a number of foreign countries,” Kupec said, acknowledging that Trump has also helped to facilitate communications for Barr and Durham with foreign powers, Fox reports.

The Steele dossier is a compilation of documents gathered by former British intelligence officer Christopher Steele, who worked during the 2016 campaign cycle to investigate the existence of a possible conspiracy between President Donald Trump and the Russian government.

“As soon as Horowitz is done with his review of the FISA warrant application, the counterintelligence investigation, the Trump campaign, we’ll have a hearing in public with Horowitz and we’ll call a bunch of witnesses,” Senate Judiciary Committee Chairman Lindsey Graham (R-S.C.) said on Fox Business’ “Sunday Morning Futures.”

Trump and GOP lawmakers are confident that Durham’s probe will uncover evidence that will cripple impeachment efforts that are feared of by the left.

“Democrats are afraid that the reports will validate what the president has been saying for years—his enemies in Congress are so desperate to undo the results of the 2016 election that they will manufacture conspiracies and sell them to the American people,” a senior Republican aide said to Fox News on Tuesday.

“I predict you will see things that you don’t even believe, the level of corruption—whether it’s [James] Comey; whether it’s [Peter] Strzok and his lover, [Lisa] Page; whether it’s so many other people—[Andrew] McCabe; whether it’s President Obama himself,” Trump told reporters last week, according to Fox.