Calls were escalating Thursday from lawmakers and major business groups, including the National Association of Manufacturers (NAM), for President Trump to step down from office before his term ends on Jan. 20.

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A mob of Trump supporters on Wednesday stormed the U.S. Capitol, wreaking havoc and terror inside the hallowed halls of democracy. Four people died in the rampage.

In reaction, members of Congress and NAM, which represents 14,000 U.S. corporations including ExxonMobil and Chevron Corp., urged Vice President Pence and the Cabinet to move forward with invoking the 25th Amendment to the U.S. Constitution.

“This is not the vision of America that manufacturers believe in and work so hard to defend,” NAM CEO Jay Timmons said. “Across America today, millions of...