The Democratic National Committee has requested that a federal judge block efforts by the Republican National Committee to coordinate with Donald Trump as he calls for poll watchers amid claims the election is “rigged” against him. That tactic, the DNC alleges, violates a more than 30-year-old legal agreement meant to keep GOP operatives in line at the polls. Mr. Trump has said Hillary Clinton will defeat him only if voter fraud and other illicit activity at polling places takes place, catapulting the issue of ballot security issues to national attention. While evidence to support those arguments is largely lacking, 43 percent of Trump’s pledged voters say they’ll believe the Republican candidate was cheated out of the election if he loses, according to a Wednesday poll from USA Today/Suffolk University. Some fear that claims of a “rigged election” may spur overzealous Trump supporters to engage in activities that could constitute illegal voter intimidation tactics. Now, Democrats are saying that GOP involvement in any such tactics could violate a 1982 consent decree that bars Republicans from using strategies that intimidate minority voters, and Republicans are trying to steer clear of Trump’s assertions.