Speaking at a daily briefing on Monday, French Foreign Ministry spokeswoman, Agnes Romatet-Espagne, expressed concern that designating the IRGC as a "terrorist" group by the United States administration could exacerbate tensions in the region.
"Whatever they do we will take reciprocal measures".
Iranian Armed Forces spokesman Masoud Jazayeri told ISNA if Trump decides to designate the Guards as terrorists, Iran would "teach Americans a new lesson".
According to the spokesman, the U.S. shouldn't pressure Iran while negotiating regional issues.
Following the reports, the IRGC chief warned that it may equate USA troops to Islamic State terrorists "if the news is correct about the stupidity of the American government".
On Monday, the Iranian Foreign Ministry also threatened to give a "crushing" response if Trump designates the IRGC as a terrorist group.
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Also, Mohammad Ali Jafari, the IRGC chief, warned on Sunday that if Trump's administration designates the IRGC terrorist then the IRGC will treat the US troops like Daesh.
He said: "If the news is correct about the stupidity of the American government in considering the Revolutionary Guards a terrorist group, then the Revolutionary Guards will consider the American Army to be like ISIS all around the world, particularly in the Middle East".
Trump is expected to "decertify" a landmark 2015 deal Iran struck with world powers to curb its nuclear program in return for the lifting of most worldwide sanctions.
Analysts say such a move would have a very limited impact on the Guards, who are already subject to a wide range of sanctions and whose external operations arm - the Qods Force - is already designated as a terrorist organisation.
His comments come just 24 hours after Iran threatened the United States with a "firm, decisive and crushing" response to sanctions.