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The last shuttle to fly was STS-135 in 2011. That was well into Zero’s term as president.

Found this on wiki...

The Space Shuttle retirement was announced in January 2004.[19]: III-347 President George W. Bush announced his Vision for Space Exploration, which called for the retirement of the Space Shuttle once it completed construction of the ISS.[58][59] To ensure the ISS was properly assembled, the contributing partners determined the need for 16 remaining assembly missions in March 2006.[19]: III-349 One additional Hubble Space Telescope servicing mission was approved in October 2006.[19]: III-352 Originally, STS-134 was to be the final Space Shuttle mission. However, the Columbia disaster resulted in additional orbiters being prepared for launch on need in the event of a rescue mission. As Atlantis was prepared for the final launch-on-need mission, the decision was made in September 2010 that it would fly as STS-135 with a four-person crew that could remain at the ISS in the event of an emergency.[19]: III-355 STS-135 launched on July 8, 2011, and landed at the KSC on July 21, 2011, at 5:57 a.m. EDT (09:57 UTC).[19]: III-398 From then until the launch of Crew Dragon Demo-2 on May 30, 2020, the US launched its astronauts aboard Russian Soyuz spacecraft.[60]

My father had a large part in the cancellation of the shuttle he was insistent it should end. After the Challenger Accident he was assigned to assess the assembly computer code. This is when they brought in Richard Feynman at the presidents request to find out what happened. We all understand it was an "o" ring failure after the vehicle froze on waiting for launch.

My father found faulty catastrophic failure in the code that could've happened anytime. Which it almost did twice before. In order to fix it the code needed to be rewritten which wasn't going to happen on the old platform they where using. The other teams found other possible catastrophic problems. The risk assessment team over ruled my fathers decision to shut it down right away. Though it was phased out.