Veto of Energy Measure Is Raised as a Possibility

By JOHN M. BRODER

Published: December 12, 2007

WASHINGTON — The White House has raised last-minute concerns over regulation of automobile emissions and fuel economy that aides said Tuesday could lead to a presidential veto of the energy bill now before Congress.

The bill, which passed the House and is pending in the Senate, requires automakers to meet a fleet average of 35 miles per gallon by 2020, but does not specify which government agency should enforce the new rule.