The campaign to build a memorial on the National Mall in honor of the Rev. Martin Luther King Jr. received a $1 million boost Monday from a major insurance firm, bringing the effort ever closer to the $100 million goal.

Prudential Financial Chairman Art Ryan announced his firm’s contribution during a news conference at the National Press Club. The memorial campaign so far has collected $78.5 million, including $10 million from General Motors and $5 million from Tommy Hilfiger.