Liz Truss is under mounting pressure to keep a UK Government pledge to raise benefits in line with inflation.
The Tory Prime Minister has so far refused to commit to an uplift in Universal Credit from next April - despite warnings that some Scots are already being forced to choose between "heating and eating".
It comes as anti-poverty campaigners called for action after a "heart-breaking" report revealed a "bleak picture of a society in crisis".
