It sounds like this proposal is meant to prevent a third-party candidate from drawing votes away from the main nominee who can challenge President Trump. The idea would likely be positioning all opposition to back one candidate in order to increase the chance of victory in November. This strategy is often used to avoid splitting the vote in an election, which may lead to the incumbent or less preferred candidate winning. However, this depends completely on the agreement of all parties involved.
Biden rival proposes ‘no-spoiler pledge’ in order to take on Trump in November
