Trump Jr. calls out 2024 GOP hopefuls for 'lack of action'

President TrumpDonald TrumpNew Capitol Police chief to take over Friday Overnight Health Care: Biden officials says no change to masking guidance right now | Missouri Supreme Court rules in favor of Medicaid expansion | Mississippi's attorney general asks Supreme Court to overturn Roe v. Wade Michael Wolff and the art of monetizing gossip MORE's eldest son Donald Trump Jr. on Thursday called out potential 2024 Republican presidential hopefuls for not being supportive enough of his father as votes are counted across the country to determine a White House winner.

Trump Jr., who is seen as a potential future political candidate, decried a "total lack of action" from those who may make a run in four years, as the current presidential race comes down to the wire in a handful of battleground states.

“They have a perfect platform to show that they’re willing & able to fight but they will cower to the media mob instead,” Trump Jr. tweeted, adding that his father "will fight & they can watch as usual!”

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The president's other adult son, Eric TrumpEric TrumpTrump to Pence on Jan. 6: 'You don't have the courage' Florida city bans gambling amid prospects of Trump-owned casino Lara Trump on Senate bid: 'No for now, not no forever' MORE, also bemoaned what he viewed as a lack of GOP action to support his father, calling on Republicans to "have some backbone."

"Fight against this fraud. Our voters will never forget you if your [sic] sheep!" he tweeted.

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Trump's sons called on Republicans to step up efforts to defend their father as the president's campaign and GOP officials scramble to file lawsuits in several states to stop vote-counting as estimates show the president beginning to lose ground to Democratic nominee Joe BidenJoe BidenOvernight Defense: Senate panel adds B to Biden's defense budget | House passes bill to streamline visa process for Afghans who helped US | Pentagon confirms 7 Colombians arrested in Haiti leader's killing had US training On The Money: Senate braces for nasty debt ceiling fight | Democrats pushing for changes to bipartisan deal | Housing prices hit new high in June Hillicon Valley: Democrats introduce bill to hold platforms accountable for misinformation during health crises | Website outages hit Olympics, Amazon and major banks MORE.

Shortly after Trump Jr.'s initial tweet, a number of Republicans who are viewed as possible contenders for the party's 2024 nomination chimed in on Twitter, voicing support for President Trump while urging for a fair election.

“All votes that are *legally* cast should be counted. There is NO excuse not to allow poll watchers to observe counting,” tweeted Sen. Tom CottonTom Bryant CottonEx-Rep. Abby Finkenauer running for Senate in Iowa Poll: Trump leads 2024 GOP primary trailed by Pence, DeSantis Republicans raise concerns about Olympians using digital yuan during Beijing Games MORE (R-Ark.).

Former South Carolina Gov. Nikki HaleyNikki HaleyPoll: Trump leads 2024 GOP primary trailed by Pence, DeSantis Trump is a complication for Republican hopes in Virginia The Memo: Trump is diminished but hasn't faded MORE (R), who served as United Nations ambassador under Trump, also tweeted, "We all owe @realDonaldTrump for his leadership of conservative victories for Senate, House, & state legislatures."

"He and the American people deserve transparency & fairness as the votes are counted. The law must be followed. We have to keep the faith that the truth will prevail,” she added.

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Trump Jr. noted that Sen. Josh HawleyJoshua (Josh) David HawleyCompetition laws could be a death knell for startup mergers and acquisitions Democrat stalls Biden's border nominee Poll: Trump leads 2024 GOP primary trailed by Pence, DeSantis MORE (R-Mo.), who has also been floated as a potential 2024 candidate, had already weighed in saying he would introduce legislation pushing for an array of voting changes.

“If last 24 hrs have made anything clear, it’s that we need new election integrity laws NOW. Ban ballot harvesting, guarantee poll watcher access, make ballot counting transparent. I will introduce,” Haley had tweeted. 

Political observers have begun speculating as to who could take up the GOP mantle in 2024 if Trump loses the election, with some floating Trump Jr., Cotton, Haley, Hawley, Vice President Pence and Secretary of State Mike PompeoMike PompeoPoll: Trump leads 2024 GOP primary trailed by Pence, DeSantis Pence v. Biden on China: Competing but consistent visions Overnight Defense: Milley reportedly warned Trump against Iran strikes | Pulitzer Prize-winning photographer killed in Afghanistan | 70 percent of active-duty military at least partially vaccinated MORE, among others.

The president is currently trailing in Nevada and Arizona, and his narrow leads in Pennsylvania and Georgia are winnowing.