A clear pattern is emerging. Democrats across the country are obstructing federal law enforcement. Their actions endanger lives and set a dangerous example for others.As part of their latest gambit, some Democrat-governed states are refusing to issue license plates for federal law enforcement vehicles.

On May 12, the DOJ sent letters to the governors of Oregon and Massachusetts and the attorneys general of Washington and Maine, demanding that they revoke their policies.

In a letter to Washington Attorney General Nick Brown, U.S. Assistant Attorney General Brett Shumate warned that the state’s refusal to issue undercover license plates to all Department of Homeland Security vehicles was “not only deeply dangerous as a matter of public safety but also blatantly unlawful as a matter of constitutional law.”

Shumate pointed out that federal agents investigate serious crimes such as drug trafficking, weapons trafficking, human trafficking, terrorism, and fraud. Surveillance and other covert activities are key to fulfilling these responsibilities.

This is dangerous work, and those doing it deserve to be supported, not thwarted.