Never-before-seen documentary footage released Sunday shows the late Sen. Lindsey Graham calling his multipronged campaign for war with Iran “the best thing I’ve ever done” and comparing President Donald Trump and Israeli Prime Minister Benjamin Netanyahu to Franklin D. Roosevelt and Winston Churchill.

Graham, who had a reputation in Washington as a war hawk, granted access to British filmmaker Alex Holder, who said he captured over 400 hours of footage of the late senator over several years. Graham put himself at the center of Trump’s biggest ambitions in the president’s second term, including the Iran war and a massive modernization of the Pentagon.

The documentary captures calls with Trump, Prime Minister Benjamin Netanyahu and even Democratic former national security adviser Jake Sullivan as Graham cheered on the war efforts.

“It was pretty remarkable, and we had this four-and-a-half-year period of just the most, really unparalleled access, to one of the most consequential politicians in the United States,” Holder said in an interview with CNN’s Manu Raju on “Inside Politics.”

Graham over the last decade morphed into one of Trump’s most trusted counselors on high-stakes geopolitical matters, one longtime Trump adviser told CNN earlier this month, earning the president’s confidence even as they often disagreed on key strategic issues, including the extent of US support for Ukraine and the White House’s efforts to negotiate an end to the Iran war.