So I saw this morning that Donald Trump (US president) claimed the US would be at war with North Korea by now if he hadn't been elected.
This made me wonder if there are any restrictions on what a politician can make or whether this is all down to public opinion (the public pointing out that tensions have been going on for decades or that Donald Trump was originally escalating things rather than calming them down).
Can a politician make any claim and the onus is on their opposition to prove them wrong?
(I'm more interested in the west but if this or 'politician' is too broad then answer specifically on the US president)