Donald J. Trump told the American people during his presidential campaign, “This country is being drained of its jobs and its money because we have stupid people making bad deals.” He promised to make better deals, ones in which we would win so much we “may even get tired of winning.”

Now his administration, through the Army, is on the brink of making a bad deal, giving a French pharmaceutical company, Sanofi, the exclusive license to patents and thus a monopoly to sell a vaccine against the Zika virus. If Mr. Trump allows this deal, Sanofi will be able to charge whatever astronomical price it wants for its vaccine. Millions of people in the United States and around the world will not be able to afford it even though American taxpayers have already spent more than $1 billion on Zika research and prevention efforts, including millions to develop this vaccine.

The Department of Health and Human Services gave Sanofi $43 million to develop the Zika vaccine with the United States Army. And the company is expected to receive at least $130 million more in federal funding.

Sanofi is not a nonprofit or a tiny start-up struggling to bring medicine to market. Its chief executive, Olivier Brandicourt, earns about $4.5 million a year. Even the government of France criticized this salary, calling it “incomprehensible,” yet the American government is perfectly happy to enrich Mr. Brandicourt even more.