President Donald Trump's two sons, Donald Trump Jr and Eric Trump have rebuked Republicans for failing to back the president as he struggles to win re-election.
Don Jr, President Trump's eldest son, accused the party of being "weak", while his brother Eric warned: "Our voters will never forget you if your [sic] sheep!" reports BBC.
The spat reflects an emerging rift between Trump disciples and the Republican party.
The election still hangs in the balance but Democratic White Whouse hopeful Joe Biden appears to be closing in on victory.
Trump has vowed to mount legal challenges to the vote-counting process after claiming that there is widespread voter fraud, but he dis not curculate any evidence.
As Trump's sons criticise party leaders, Senior Republicans such as Maryland Governor Larry Hogan and Utah Senator Mitt Romney have warned he is undermining the democratic process.
But Don Jr, who is thought to have political aspirations of his own, reserved his ire for those who may be eyeing up a presidential run in 2024.
"The total lack of action from virtually all of the '2024 GOP [Republican] hopefuls' is pretty amazing," he wrote on Twitter.
Trump's eldest son continued: "They have a perfect platform to show that they're willing & able to fight but they will cower to the media mob instead. Don't worry @realDonaldTrump will fight & they can watch as usual!"
The tweet was in response one from Mike Cernovich, a Trump supporter and men's rights activist, who had criticised the president's former UN ambassador, Nikki Haley.
Nikki Haley is widely thought to be preparing a White House bid in 2024.
Eric Trump tweeted: "Where are Republicans! Have some backbone. Fight against this fraud. Our voters will never forget you if your [sic] sheep!"