A speechwriter for former President George W. Bush on Friday called President-elect Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE “the worst human being ever to enter the presidency” just hours before Trump's inauguration.

“The worst human being ever to enter the presidency, and I include all the slaveholders,” tweeted David Frum, a former Bush speechwriter who is now a senior editor at The Atlantic.

The worst human being ever to enter the presidency, and I include all the slaveholders. — David Frum (@davidfrum) January 20, 2017

Andrew Jackson was at least physically brave — David Frum (@davidfrum) January 20, 2017

Frum this week published a piece in The Atlantic titled "An Inaugural Celebration That Rings Hollow," in which he wrote that the lesson of Trump's inauguration "is that the system has failed."

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Frum served as a speechwriter for Bush from 2000 to 2002.

Bush will attend Trump’s inauguration Friday morning with his wife, former first lady Laura Bush.

Bush’s parents, former President George H.W. Bush and Barbara Bush, were both hospitalized Wednesday and will not attend Trump’s inauguration ceremony.

During the GOP presidential primary, Trump frequently tore into Jeb Bush — George W. Bush's brother — and occasionally attacked both former presidents Bush as well.