Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: The SNP will not lend its support to any party that favours Trident renewal if there is a hung parliament after the UK general election next year.

'No Trident renewal' key to any post-election SNP deal