President has suggested steam catapults every year since 2017, saying digital systems are too ‘complicated’

After nearly a decade of loudly complaining about the fact that modern US aircraft carriers use electromagnetic systems to launch fighter jets instead of steam-powered catapults, Donald Trump has directed the Pentagon to redesign a new aircraft carrier to replace the modern system with the old-fashioned catapults he prefers.

Trump signed a national security memorandum on Thursday directing the defense secretary, Pete Hegseth, and the acting navy secretary, Hung Cao, to make the change he has had his heart set on since at least 2017, when he first described his idea to Time magazine.

As Karoline Leavitt plans to step down, it’s apparent how the president above all values a readiness to twist the truth

As Karoline Leavitt prepares to step down from her role as Donald Trump’s fifth White House press secretary, a brief review of her tenure, and that of her predecessors, makes clear that the most fabulist president in US history prizes one quality above all else in the women and men who speak for him: a willingness to tell outrageous lies.

Leavitt started her tenure by telling a wild falsehood at her very first news conference, when she claimed that the Biden administration had planned to use $50m in taxpayer dollars to send condoms to Gaza. Later the same day, the Guardian reported that the claim was directly contradicted by USAID records.

This live blog is now closed.

• Sign up for the Breaking News US email

Donald Trump’s executive order on vaccines does not change the US recommendations for the shots – but experts say it does create confusion and doubt about vaccines, which will lead to more illness and possibly deaths among children and will make it harder for families and pediatricians to protect them.

The executive order was an attempt to reinstate sweeping changes to the vaccine schedule made earlier this year by Robert F Kennedy Jr, secretary of the US Department of Health and Human Services and a longtime vaccine opponent – changes that were later halted by a federal judge.