President Donald Trump's warmonger bestie, Republican Senator Lindsey Graham, tore into European allies who've been reluctant to help keep the Strait of Hormuz open amid the war with Iran. 

Graham aired out his grievances on X Tuesday, chiding US allies for their 'arrogance' and revealing how upset Trump was about the snub.

'I have never heard him so angry in my life,' Graham said. 'I share that anger given what's at stake.'

The South Carolina Republican has pushed for a war with Iran for more than a decade and has cheered on Trump's actions, even though the war could put the Republicans in political peril if prices skyrocket. 

Trump's military assault has now lasted 19 days, and he's asked NATO members, along with Japan, South Korea, and even China, a US rival, to contribute military vessels to escort commercial ships through the Strait of Hormuz - in an effort to avoid an economic downturn. 

So far, he's gotten no takers.

'Well, we don't need too much help,' Trump said in the Oval Office on Tuesday, brushing off allies' resistance.  

Directly after, he chewed out NATO. 

'I think NATO is making a very foolish mistake,' he told reporters. 'And I've long said that, you know, I wonder whether or not NATO would ever be there for us. So this was a great test, because we don't need them, but they should have been there.' 

Trump has long been critical of the NATO alliance, formed to put a check on Russian influence. 

In his post, Graham pushed that there would be repercussions and that Europe sitting this one out would be felt 'wide and deep.' 

'I consider myself very forward-leaning on supporting alliances, however at a time of real testing like this, it makes me second guess that value of these alliances,' the South Carolina senator said. 

'I am certain I am not the only senator who feels this way,' Graham added. 

Graham's tough talk comes a day after he filed to run for reelection in the 2026 Senate race.  

'Nobody is better prepared to help President Trump protect us from evil than I am. Nobody is better prepared to help him get his agenda through the Senate than I am. Nobody running is better prepared to help our state than I am,' Graham said at the time of the filing. 

He's held his seat since 2003. 

Democrats thought they might have a chance to expel Graham from the Senate in 2020, with the selection of up-and-comer Jaime Harrison, who went on to become the Democratic National Committee chair. 

Despite having $132 million at his disposal, Harrison still came up short by 10 points. 

A December Public Policy Polling survey again showed that Graham could be vulnerable, with him leading a generic Democrat by just two points. 

But when voters were asked to rate Graham versus one of the Democrats running in the primary, Dr. Annie Andrews, his lead extended to six points. 

Candidates have until March 30 to file their paperwork to run in the race. 

Some Democrats have floated that South Carolina native Stephen Colbert should challenge Graham, as he's departing The Late Show in May, after CBS' controversial decision to cancel it. 

A MoveOn petition pushing Colbert to enter the South Carolina US Senate race currently has more than 700 signatures.