BOSTON — U.S. Sen. Elizabeth Warren is joining fellow Sen. Edward Markey, Boston Mayor Thomas Menino and the families of gun violence victims to press for tougher national gun laws.

The Wednesday rally at Faneuil Hall will call on Congress to pass stricter background checks for gun buyers.

Backers of tougher gun laws are hoping Congress will again take up a bill that would expand background checks to include gun shows and online sales.

Earlier this year an expanded background check bill sponsored Pennsylvania Republican Sen. Patrick Toomey and West Virginian Democrat Sen. Joe Manchin failed to win the 60 votes needed to advance. That bill would have exempted sales between friends from background checks.

The rally is organized by Mayors Against Illegal Guns. Menino is co-chairman of the group with New York Mayor Michael Bloomberg.

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