WASHINGTON — President Biden is asking Congress to approve another $20.6 billion to support Ukraine in its war against Russia, despite mounting public opposition — more than five times the $3.9 billion he wants for US border security, migrant processing and anti-fentanyl efforts. The new funding requests were announced Thursday ahead of an anticipated budget showdown in late September, when House GOP conservatives are expected to demand cuts in exchange for avoiding a partial government shutdown. At least some of the border-related funds would help sponsor care for migrants released at the US-Mexico frontier following New York City Mayor Eric...