Full Idea
Either p or not-p. If p, then the proposition 'p' is true. If not p, then the proposition 'not p' is true. Either way, something is true. Thus something exists.
Gist of Idea
Either p is true or not-p is true, so something is true, so something exists
Source
David Liggins (Truth-makers and dependence [2012], 10.3 n5)
Book Reference
'Metaphysical Grounding', ed/tr. Correia,F/Schnieder,B [CUP 2012], p.260
A Reaction
Liggins offers this dodgy argument as an objection to conceptual truths having truth-makers.