Washington (CNN) Former Sen. Bob Dole was helped out of his wheelchair Tuesday to salute former President George H.W. Bush as he lay in state at the Capitol Rotunda.

Bush's son Jeb acknowledged the moment on Twitter, thanking the Kansas Republican and calling his salute "Just incredible."

Just incredible. Thank you Senator Dole. https://t.co/yhKG4DLCQU — Jeb Bush (@JebBush) December 4, 2018

Dole, 95, once faced Bush during the 1988 Republican primary fight for the presidential nomination but nonetheless maintained a decades-old friendship with the former president.

On Saturday, he reflected on their relationship, telling CNN's Ana Cabrera that his passing was an end of an era, as Bush was the last World War II veteran to serve as president. Dole also served in the war.

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