In a rebuke to U.S. Republican presidential nominee Donald Trump and the GOP, the Democratic Party's policy platform has touted Washington's network of alliances — including its defense pact with Japan — as "a source of tremendous strategic advantage."

The Democratic Party platform, set to be ratified at the party's convention that opened Monday in Philadelphia, trains it guns on Trump, saying that the U.S. "cannot walk away" from its "position of global leadership."

"We believe that we are stronger when we work with our partners and allies, rather than try to go it alone," it reads. "Our global network of alliances is not a burden — it is a source of tremendous strategic advantage."