Boris Johnson hoped to use his Conservative Party's annual convention to launch his campaign to win the next British general election. Instead, he is fighting for his credibility as prime minister as he faces allegations of sexual impropriety and plots to oust him.

After two months in charge of the U.K. government, Johnson was forced to deny he groped a journalist at a lunch around 20 years ago, and batted away allegations that he had a sexual relationship with a businesswoman and authorized taxpayer-funded sponsorship for her company during his time as London mayor.

The furor overshadowed his first appearance as prime minister at his ruling Conservative Party's annual conference in Manchester, England. The grassroots members propelled him to power in July after he promised to complete the U.K.'s divorce from the European Union — whatever the cost — by the deadline of Oct. 31.