This is high level, complex English and well written.  There are some minor points.  

About the Ceta and TTIP agreements

The planned trade agreement between the EU and Canada is seen as a blueprint (1 word) for the controversial TTIP agreement with the US. Right before a debate in the German Parliament (capitalize because you're referring to a specific Parliament), president Joachim Gauck calls (using calls is not incorrect if he has not yet gone to Ottawa however called would be a better choice) for an open discussion during his state visit in Ottawa.

A hefty (heated might be a better word choice if there is going to be strong disagreement) exchange is expected in the German parliament on Thursday between the government and the opposition concerning the controversial trade agreement. The Left Party and the Green Party warn against certain safeguard clauses being given to companies in the treaties planned between the EU and Canada (Ceta) and the EU and the US (TTIP). The German Minister for Economic Affairs (capitalize because it is his formal title), Sigmar Gabriel, wants to make his own position on TTIP and Ceta clear in Parliament.