Republicans hope Wisconsin will slow Donald Trump

Next Tuesday’s Wisconsin presidential primary is a crucial lifeline for Republicans desperate to stop Donald Trump’s march to their party’s nomination. 

One of his worst weeks of the 2016 campaign is colliding with a state sceptical of his politics.

A big loss there for Trump would greatly reduce his chances of securing the delegates he needs to clinch the Republican nomination before next July’s national convention. It could also offer hope to rival Ted Cruz, and to outside groups that see Trump as a threat to the party.