The PM said the SNP and Labour presented a 'clear and present danger ' He said the five parties were 'really on the same side ' in the election . Mr Cameron said Ed Miliband can only become PM with the SNP 's support . Comes ahead of tonight 's live TV debate between the main 'challengers ' Mr Cameron and the Lib Dem leader Nick Clegg will not take part .
The PM said the SNP and Labour presented a 'clear and present danger ' He said the two parties were 'really on the same side ' in the election . Mr Cameron said Ed Miliband can only become PM with the SNP 's support . Comes ahead of tonight 's live TV debate between the main 'challengers ' Mr Cameron and the Lib Dem leader Nick Clegg will not take part .