WASHINGTON (AP) — Presidents Joe Biden and Xi Jinping will speak Thursday, according to a U.S. official, their first conversation in four months coming amid new tension between Washington and Beijing over China's claims on Taiwan. The planned talks between the two leaders — the fifth in a series of regular check-ins — have been in the works for weeks. But the possibility of a visit to Taiwan by House Speaker Nancy Pelosi, the top congressional Democrat and second in line of succession to the presidency, has added fresh strain to the complicated relationship.