A confident Donald Trump suggested Saturday morning that his supporters are so loyal that they wouldn't even abandon him if he went on a gun rampage .

'I could stand in the middle of Fifth Avenue and shoot somebody and I wouldn't lose any voters, okay? It's like – incredible!' the Republican front-runner said during a campaign rally in Sioux Center, Iowa.

He hedged that statement hours later in the town of Pella that 'I could do almost anything. I don't want to – if I do something bad, say "Bye-bye Mr. Trump." Or "Donald".'

Trump has attracted an unusually loyal following, with pollsters reporting that large numbers are solidly behind him.

At the same time, a similar base of anti-Trump Republicans say he's the one GOP presidential hopeful they would never vote for under any circumstances.

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BANG: Donald Trump said his supporters are so loyal to him that he could open fire on a crowded street and they would still stay in line

LAWSUIT? The Donald floated the idea of suing Ted Cruz over the question of whether his Canadian birth rules him out of running for the White House

SUPPORT: Iowa supporters rolled a mobile billboard in Sioux Center reading : 'Could God be for Trump?'

He preached to the former group in the first of two Saturday rallies, lapsing into the salty language that has become a hallmark of his speeches.

He commented on a raft of TV ads he has seen in Iowa – bought by campaigns and super PACs supporting Ben Carson, Marco Rubio and Ted Cruz – that hammer him on everything from illegal immigration to foreign policy.

'Those ads are total bulls**t,' he boomed.

Trump called Jeb Bush 'not a smart person,' making a 'cuckoo' motion near his head and asking: 'Who the hell wants to listen to this guy?'

Minutes later Trump floated the idea of filing a lawsuit to challenge the Canadian-born Cruz's eligibility to run for president.

'He could run for the Prime Minister of Canada and I wouldn’t even complain because he was born in Canada,' he joked.

'The Democrats are going to sue if he ever got the nomination within two days. There have already been two lawsuits filed, but they don’t have standing. I have standing to sue. Can you imagine if I did it? Should I do it just for fun?'

'If I thought it was going to matter, maybe I would do it, maybe I wouldn’t,' he said.

The billionaire also took aim at the 'stupid National Review,' a storied conservative magazine that marshalled 22 right-wing thinkers to attack him in a special issue released Friday night.

OVERFLOW: The Trump rally drew an estimated 1,500 people in rural western Iowa

LOYAL: Iowans braved sub-freezing temperatures on a Saturday morning to see their political hero

Top on his list was Internet broadcaster and former Fox News Channel host Glenn Beck, who wrote that 'Trump’s potential primary victory would provide Hillary Clinton with the easiest imaginable path to the White House.'

Trump shot back.

'His show is failing. He's failing,' he said, calling Beck a 'serious loser' and a 'sad sack.'

'He's always crying!' he said of Beck. 'I cried when I was one year old. I was a baby.'

Trump also chided Iowans for picking 'a lot of losers' in past caucuses, referring to recent election cycles that picked Rick Santorum and Mike Huckabee – neither of whom went on to win the Republican nomination.

He urged his fans to brave the cold on the evening of February 1 to support him in their precinct caucuses.

Cruz, he said, is 'going down big, big, big!' in the polls.