WASHINGTON—The White House will reopen to the public next month after being shuttered two years amid the COVID-19 pandemic, it said on Tuesday, with the U.S. Capitol reportedly also weighing plans. The White House will open for tours starting April 15 two days a week, it said in a statement, adding that masks are optional and those who have tested positive for the novel coronavirus or are otherwise possibly ill should not attend. Congress is also weighing a phased reopening starting March 28 and moving toward a full reopening by Sept. 5, the Washington Post reported, citing an unnamed source. The moves this spring come as U.S. COVID-19 cases continue to decline following the Omicron variant-driven spike, even as mounting cases in Europe and China have raised some concerns about the potential for another wave. “The White House will continue to closely monitor the COVID-19 situation with guidance based on …