Warren, Michigan - Donald Trump promised Tuesday that he is just getting started as he marked the radical and vengeful beginning of a presidency that has shaken the world and destabilized the US.

Basking in the adulation of cheering supporters in Michigan, the 78-year-old touted the "most successful first 100 days of any administration in the history of our country," even as polls show Americans becoming disenchanted with the economic and political tumult.

Trump said he missed the campaign trail, and launched with visible relish into a speech that often sounded more like that of a candidate than a head of state.

Joe Biden is "sleepy," the media is "fake," judges who oppose him are "communist," Democratic opponents are "radical left," and friendly countries have "abused us more so than foes on trade," Trump said, listing targets of his ire.

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The president promised to conclude deals on trade, but provided little in the way of details.

And – to chants of "USA! USA!" – he showed a video of migrants in handcuffs and shackles being taken from a plane, transported by bus and filmed on their knees as their heads were shaved, illustrating his alarmingly aggressive deportation policy.