Trump: Clinton's VP pick 'VERY disrespectful' to Sanders, supporters
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Donald TrumpDonald John TrumpAmash responds to 'Send her back' chants at Trump rally: 'This is how history's worst episodes begin' McConnell: Trump 'on to something' with attacks on Dem congresswomen Trump blasts 'corrupt' Puerto Rico's leaders amid political crisis MORE early Sunday said Hillary ClintonHillary Diane Rodham ClintonHillary Clinton slams Trump rally: 'The time has come again' to fight for democracy Trump blasts minority Democrats, rally crowd chants 'send her back' The Memo: Democrats debate Trump response – 'Being righteous and losing sucks' MORE’s selection of Sen. Tim KaineTimothy (Tim) Michael KaineDems open to killing filibuster in next Congress Federal guidance identifying 'go back to where you came from' as discrimination goes viral after Trump comments Trump's pick to lead Pentagon glides through confirmation hearing MORE (D-Va.) as a running mate on the Democratic presidential ticket is “VERY disrespectful to Bernie SandersBernie Sanders2020 Democrats react to 'send her back' chants at Trump rally Cardi B posts message of support for Ilhan Omar #IStandWithIlhan trends after crowd at Trump rally chants 'send her back' MORE and all of his supporters."

The Republican presidential nominees also tweeted that it looks like the Vermont senator's supporters will “fight,” adding that if they don’t, “there [sic] blood, sweat and tears was [sic] a total waist [sic] of time.” He later deleted that tweet and posted corrected text.

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Clinton, the presumptive Democratic presidential nominee, announced her selection on Friday night. She appeared with Kaine at a rally in Miami on Saturday.

The Virginia senator is widely viewed as a "safe" pick, but the choice garnered criticism from Sanders for not being progressive enough.

The Democratic Rules Committee on Saturday voted overwhelmingly to reduce the influence of superdelegates in the 2020 presidential election after a deal was reached between Clinton and Sanders supporters.

Reports also surfaced late Saturday that Democratic National Committee (DNC) Chairwoman Debbie Wasserman Schultz would not speak this week at the Democratic National Convention in Philadelphia.

The development follows the leak of internal DNC emails that show an effort to undermine Sanders's presidential campaign.

— This report was updated at 8:28 a.m.