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Kristie Higgs believes same-sex marriages are against God's law - and "God does not make mistakes".
The move, ahead of a statement from the PM, reflects that transmission is "high or rising exponentially".
Newport, Bridgend, Merthyr Tydfil and Blaenau Gwent face new restrictions from 18:00 BST on Tuesday.
Five patients have died in total as a result of a Covid-19 outbreak in the hospital's male medical ward.
The former PM argues the legislation will "damage trust", but ministers say it will protect the UK.
James Rowley admitted manslaughter and dangerous driving over Joe Higgins's death.
In the last seven days, 1,014 people have tested positive for coronavirus in Northern Ireland.
Additional measures will "almost certainly" be announced in the next 48 hours, First Minister Nicola Sturgeon says.
People in affected areas will be allowed to look after children from outside their households.
"Speed" and "action" are required to halt the rise in cases, the UK's chief scientific adviser warns.