BEIJING (Reuters) - Prominent Chinese commentator Hu Xijin said on Saturday he deleted a tweet warning of military retaliation should U.S. fighter jets escort House Speaker Nancy Pelosi on any visit to Taiwan, after Twitter blocked his account. Pelosi, number three in the U.S. line of presidential succession, after Joe Biden and Vice President Kamala Harris, signalled on Friday she was embarking on a trip to Asia. She did not mention Taiwan, but speculation of her visiting the democratically ruled island, claimed by Beijing, has intensified in recent days, fuelling tensions beyond the Taiwan Strait. Chinese President Xi Jinping warned...