WASHINGTON — Looking beyond the $1.9 trillion COVID-19 relief bill, President Joe Biden and lawmakers are laying the groundwork for another top legislative priority — a long-sought boost to the nation’s roads, bridges and other infrastructure that could run into Republican resistance to a hefty price tag. Biden and his team have begun discussions on the possible outlines of an infrastructure package with members of Congress, particularly mindful that Texas’ recent struggles with power outages and water shortages after a brutal winter storm present an opportunity for agreement on sustained spending on infrastructure. Gina McCarthy, Biden’s national climate adviser, told The Associated Press that the deadly winter storm in Texas should be a “wake-up call” for the need for energy systems and other infrastructure that are more reliable and resilient. “The infrastructure is not built to withstand these extreme weather conditions,” said Liz Sherwood-Randall, a homeland security aide to the president.