We'll be back tomorrow with more from the final days of the Trump presidency. Here's the key news today and links to all our coverage.

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  Double act trumps all previous impeachments The history of impeachments in the US shows what a dubious distinction Donald Trump enjoys, with two out of all five the nation's legislators have undertaken.

• What next for Donald Trump Being impeached is not the same as being convicted and kicked out of office or barred from holding it again. The devil, as usual, is in the detail.
• FBI urges police across the US to be on high alert FBI director Christopher Wray warned about potential attacks on state capitals, federal buildings, the homes of congressional members and on businesses.
• Business pressure mounts on Republicans to dump Trump From Amazon to Walmart, a lengthening list of blue-chip giants of corporate America are pledging to cut off funds to Republicans who opposed certifying the victory of Joe Biden.
• Social media giants look certain to lose protections The storming of the Capitol building was the last straw for many US politicians who feel platforms wield too much power.
• America’s political crisis runs deeper than ideology You can only counter the legacy of Trump if you first grasp why he was so potent to start with.
• Beware the anti-Trump tyrants Malcolm Turnbull's call for the government to censor MPs questioning masks and the vaccine shows the former PM is clueless about the real meaning of freedom of speech, writes John Roskam.