David Cameron is holding talks with the German Chancellor Angela Merkel in Berlin today - someone he needs to win over if he is to have any chance of pushing his EU reform plans through.
He is also due to meet the Polish Prime Minister today, as he wraps up his bid to renegotiate the terms of the UK's membership of the European Union with key leaders.
David Cameron's mission to reform the EU treaty was given a significant boost today, as German Chancellor Angela Merkel said: "Where there is a will, there is a way".
The Prime Minister was in Germany for the latest part of his European charm offensive - though earlier in the day, in Poland, his views were not so well received.
Leaders in Poland are upset by plans to curb benefits for foreign workers.
ITV News Europe Editor James Mates reports:
David Cameron has begun a whirlwind tour of Europe to discuss his terms for renegotiating the UK's membership of the EU with key leaders.
Prime Minister plans a whistle-stop charm offensive with EU leaders this week.
Details of the In/Out referendum will be presented to Parliament in a Bill this morning.