The Senate is launching a replacement for the defense law veto over the weekend

Senate Majority Leader Mitch McConnell walks through the U.S. Capitol in Washington on December 30th.

Photographer: Ting Shen / Bloomberg

The Senate advanced Wednesday toward a vote to overturn President Donald Trump’s veto of a $ 740.5 billion defense policy bill, setting up a showdown with the White House that may not culminate until the last hours before the new Congress begins on Sunday.

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