LONDON — Britain’s newly elected Conservative government plans to ban local authorities from taking part in the boycott-Israel movement, a British official said, following the lead of American officials who have also sought to clamp down on the campaign to pressure Israel to change its policies toward the Palestinians.

In his party’s pre-election manifesto last month, Prime Minister Boris Johnson of Britain mentioned the Boycott, Divestment and Sanctions movement, or B.D.S., as one of a number of things that “undermine community cohesion.”

As a result, the manifesto said, “We will ban public bodies from imposing their own direct or indirect boycotts, disinvestment or sanctions campaigns against foreign countries.”

Mr. Johnson is expected to announce the anti-boycott proposal during the ceremonial launch of his agenda on Thursday, when Queen Elizabeth II will read a speech prepared by his government as part of the formal opening of Parliament, British news outlets reported this week.