Sunak faces criticism over donor's racist remarks and doubts over Tory leadership
• Sunak criticized for slow response to Tory donor's racist remarks about Diane Abbott
• Former Tory deputy chair Lee Anderson's defection to Reform party angers Conservatives
• Some Tory MPs doubting Sunak can last as leader amid despair over electoral prospects
• Speculation that Penny Mordaunt could challenge Sunak in leadership contest before election
• Local elections on May 2 could spark leadership challenge if results are disastrous for Tories