* FTSE 100 down 0.2%, FTSE 250 flat
* Trump says U.S.-China trade deal may come after Nov. 2020
* Sterling gain weighs on exporters
* M&C Saatchi tumbles after another profit alert
Dec 4 (Reuters) - London's FTSE 100 fell for the fifth straight session on Wednesday, after U.S. President Donald Trump doused hopes of an imminent trade deal with China, while a stronger pound dragged shares of exporters.
The main bourse, which has shed nearly 4% in just over four sessions, was down 0.2% due to a drop in miners , while exporters such as British American Tobacco were hurt by pound's strength. The mid-cap FTSE 250 was flat by 0809 GMT.
Trump said on Tuesday that a trade agreement with Beijing might have to wait until after the U.S. presidential election in November 2020, leading to a sell off in equities and deepening FTSE's recent slide.