"The downgrading of the credit rating, coming after the election decision, is wrong timing-wise. S&P's analysis is also insufficient," Simsek tweeted.

In an unexpected move on Tuesday, S&P said it lowered Turkey's rating to BB-/B from BB/B, citing widening inflation concerns amid a sell-off in the lira currency. The announcement came ahead of snap elections called for June 24.

Copyright Reuters, 2018