The United States government’s investigation into Elon Musk now comes with a potential ‘domestic terrorist’ toe-tag.

When asked if the African-American billionaire ‘was a threat to national security, and should the US investigate his joint acquisition of Twitter with foreign governments?’

Joe Biden chuckled, then responded:

‘I think that [long pause] Elon Musk’s co-operation, and/or [long pause – looks at notes] technical relationships with other countries, is worthy of being looked at.’

Biden added:

‘Whether or not he is doing anything inappropriate – I’m suggesting that – I’m suggesting it’s worthy being looked at [mumbles], that’s all I’ll say.’

Though mentioned specifically, the national security concerns...