Questions should not be tagged based on the claimant, i.e. the person or organisation making a claim.
It's not possible to have expertise on claims by a certain person. To be an expert on claims by Donald Trump, you'd have to know about Mexican immigrants, Muslim immigrants and the Iranian government, not to being mention an expert on vaccination.
Likewise, to be an expert on the Daily Mail, you'd not only have to be an expert on immigration into the UK, but also on oncology.
Also, many claims are expressed by a variety of people. For example, Donald Trump and Robert De Niro have expressed similar claims about vaccination. We can't tag a question with everyone who's made a given claim or a similar version of it.
(Note: I'm not suggesting burninating donald-trump, as he's also the subject of numerous claims)