With the National Rifle Association in “total meltdown,” reports Politico, some top Republicans are “alarmed” about their prospects in the 2020 presidential race.

In 2016, the NRA “aired an avalanche of TV ads and pushed its 5 million-plus members to the polls for Donald Trump … propelling him in the Rust Belt states that delivered him the presidency,” the political website says.

And the gun-rights group isn’t alone in pulling back from politics. Two other major funding sources for the Trump re-election campaign — the Chamber of Commerce and the billionaire Koch brothers’ network — “are withdrawing from their once-dominant roles in electing conservatives.”

Still, the NRA has long been the 800-lb. gorilla in the GOP’s parlor.

“In recent weeks, the NRA has seen everything from a failed coup attempt to the departure of its longtime political architect to embarrassing tales of self-dealing by top leaders,” Politico says. “The turmoil is fueling fears that the organization will be profoundly diminished heading into the election, leaving the Republican Party with a gaping hole in its political machinery.”

Gun rights and the 2nd Amendment are vital concerns to many in battleground states like Michigan, North Carolina, Ohio, Pennsylvania and Wisconsin — states where Trump must do well to have any hope of winning re-election.

“No organization has been more important to conservative voter education and engagement than the NRA,” said Gregg Keller, former director of the American Conservative Union. “We all hope they’re able to mount the kind of effort in the 2020 cycle they have in the past. But in case they can’t, given their current situation, I hope they’re being forthright about that within the movement so others can pick up the slack.”

“The situation has folks nervous,” Keller said, according to Politico.

One key element of the NRA’s recent troubles was last week’s resignation of Chris Cox, who ran the gun group’s lobbying arm for the past 17 years. It remains to be seen whether someone else can take over his role effectively, al though Jason Ouimet, an NRA director of federal affairs, will fill in temporarily.

As for the Chamber of Commerce, Politico reports, it spent $10 million on the 2018 mid-terms, only about a third of what it funneled to conservatives — including Trump — in the 2016 election cycle.

And meanwhile, Politico says, “the Koch network is gradually shifting away from partisanship and toward policy issues like addressing poverty and drug addiction. The network, which like the Chamber has at times found itself at odds with the president, plans to sit out the 2020 presidential race and is recasting itself in a nonpartisan fashion.”