Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE appears to be facing a significant surrogate deficit in a general election battle against Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE.

The challenge Trump faces came to the forefront this week as President Obama and Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) made headlines with their endorsements of Clinton.

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This summer and into the fall, Clinton promises to send the president, first lady Michelle Obama Michelle LeVaughn Robinson ObamaTo honor Justice Ginsburg's legacy, Biden should consider Michelle Obama National Urban League, BET launch National Black Voter Day The Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill MORE and Warren on the road. All three could be important battleground surrogates for her campaign.

Former President Bill Clinton William (Bill) Jefferson ClintonDolly Parton remembers Ginsburg: 'Her voice was soft but her message rang loud' Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Calls grow for Biden to expand election map in final sprint MORE will also hit the road for his wife, and Vice President Biden has indicated that he will be on the stump. It's not clear whether Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) will join the onslaught, though Democrats certainly hope he'll be in the fold.

Trump, in contrast, can promise few notable names.

Over the last year, the presumptive presidential nominee has feuded with his party's last two standard-bearers, John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE and Mitt Romney. Neither is expected to campaign for him.

Trump has also feuded with the Bush family and GOP stars Ted Cruz Rafael (Ted) Edward CruzVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Democrat on Graham video urging people to 'use my words against me': 'Done' MORE and Marco Rubio Marco Antonio RubioSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Florida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll MORE, both of whom he defeated in the primary.

Clinton campaign spokesman Jesse Ferguson took to Twitter on Thursday to highlight the expected lack of support for Trump from former Presidents George H.W. Bush and George W. Bush.

“Last two Democratic presidents now support [the] Democratic nominee,” Ferguson tweeted. “Last two Republican presidents DON’T support [the] Republican nominee.”

It’s possible Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (Wis.) and Senate GOP Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (Ky.) will help Trump, but both criticized the GOP candidate this week, and each will be focused on keeping a majority in his chamber of Congress.

“It’s a problem. It’s a huge problem,” said Republican strategist and columnist for The Hill John Feehery, who says he will support Trump. “He’s a nonpolitician and that’s been appealing to many people but there are some basics that every campaign needs to have and one is that you have to drive a message. Without a message, it’s hard to have a surrogate operation.”

Trump's best surrogates could be New Jersey Gov. Chris Christie, whose ratings are underwater in his own state, stalwart conservative Sen. Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE (R-Ala.) and Trump family members, such as his daughter Ivanka Trump.

In an email, Trump campaign spokeswoman Hope Hicks said the billionaire businessman will have a host of campaign surrogates.

“We have many such [surrogates] such as Governor Chris Christie, Senator Jeff Sessions, Former Speaker Newt Gingrich and many more,” she said.

Yet it is hard to see that trio outgunning the Democratic stars that Clinton can send out on her behalf.

Sessions is a conservative favorite who is popular with grassroots Republicans, but whether he can extend Trump's appeal is unclear.

And Gingrich has irked Trump with some of his remarks.

This week, he went off script, calling Trump’s racially charged comments about U.S. District Judge Gonzalo Curiel “inexcusable.”

And in a Facebook Live segment, he said Clinton’s speech on Tuesday night was “spectacular” and “very effective.”

Kevin Madden, a Republican strategist who served as an adviser to Romney during his presidential bid, called Trump’s surrogates “the Trump Green Room brigade.”

He argued too many of Trump’s supporters are relying on the candidate’s Twitter feed to figure out what to say.

“They’re like independent contractors,” said Madden, who is not supporting Trump. “And it’s not a seamless and coordinated response. It’s a mishmash” of comments.