This summer’s Democratic National Convention in Milwaukee is being pushed back to mid-August because of the coronavirus pandemic, the biggest disruption yet to the presidential campaign as a result of the crisis.

The gathering will now take place during the week of Aug. 17, the Democratic National Committee said. That delays by about a month the date when the party’s eventual nominee can start using general election dollars to directly confront President Trump.

Officials said they haven’t made any determination yet on the length of the convention or the format, given the unpredictability of the outbreak. One person familiar with planning said the duration is still expected to be four days, but that could change later.

“In our current climate of uncertainty, we believe the smartest approach is to take additional time to monitor how this situation unfolds so we can best position our party for a safe and successful convention,” said Joe Solmonese, the Democratic National Convention Committee’s chief executive.

The new schedule means the two party conventions will be scheduled on back-to-back weeks, with the Democrats going first.