Trump preemptively attacks Bill Clinton's convention speech
© Greg Nash

Republican presidential nominee Donald TrumpDonald TrumpBiden says Roe v. Wade under attack like 'never before' On student loans, Biden doesn't have an answer yet Grill company apologizes after sending meatloaf recipe on same day of rock star's death MORE on Tuesday slammed former President Bill ClintonWilliam (Bill) Jefferson ClintonPerdue proposes election police force in Georgia To boost economy and midterm outlook, Democrats must pass clean energy bill Could the coming 'red wave' election become a 'red tsunami'? MORE ahead of his speech at the Democratic National Convention.

"No matter what Bill Clinton says and no matter how well he says it, the phony media will exclaim it to be incredible," Trump tweeted a few minutes before the former president took the stage.

"Highly overrated!"

Clinton spoke Tuesday night about his wife, offering a testimonial about her character and accomplishments.

An aide familiar with the process said Clinton's speech "will very much be a personal one for him."

Earlier Tuesday night, former candidate Bernie SandersBernie SandersSunday shows preview: US reaffirms support for Ukraine amid threat of Russian invasion Filibuster becomes new litmus test for Democrats Gallego says he's been approached about challenging Sinema MORE moved for Democrats to choose Hillary ClintonHillary Diane Rodham ClintonNo Hillary — the 'Third Way' is the wrong way The dangerous erosion of Democratic Party foundations The Hill's Morning Report - Presented by Facebook - Democrats see victory in a voting rights defeat MORE as the party's presidential nominee.