Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE said on Monday that the U.S. will not be able to unite against hatred until President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE leaves office.

"Let's be very clear. You use the office of the presidency to encourage and embolden white supremacy. You use words like 'infestation' and 'invasion' to talk about human beings," 2020 contender Biden said in a tweet. "We won't truly speak with one voice against hatred until your voice is no longer in the White House."

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Trump addressed the nation from the White House on Monday, calling on Americans to condemn white supremacy after the alleged gunman in El Paso was believed to have written an anti-immigrant manifesto.

“The shooter in El Paso posted a manifesto online consumed with racist hate,” Trump said at the White House. “In one voice, our nation must condemn bigotry, hatred and white supremacy."

"These sinister ideologies must be defeated," he continued.

Trump suggested in a tweet earlier on Monday that he would support connecting stricter background checks on gun buyers to immigration reform legislation.

We cannot let those killed in El Paso, Texas, and Dayton, Ohio, die in vain. Likewise for those so seriously wounded. We can never forget them, and those many who came before them. Republicans and Democrats must come together and get strong background checks, perhaps marrying.... — Donald J. Trump (@realDonaldTrump) August 5, 2019

Democratic presidential contenders have come out in force to condemn Trump's response to last weekend's mass shootings in El Paso, Texas, and Dayton, Ohio.

A number of the candidates have said Trump's way of addressing the shootings is insufficient, while others, like former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) have said Trump's rhetoric contributed to the shooting in El Paso.