Egyptian President Abdel Fattah al-Sisi during closure of the 32nd Ordinary Session of the African Union (AU) Summit at the African Union Headquarters in Addis Ababa, Ethiopia on February 11, 2019.
The warning comes two weeks before US elections in which President Donald Trump, who has formed a close alliance with Sisi, is trailing in polls to Democrat Joe Biden.
The lawmakers raised cases including Sanaa Seif, a prominent activist taken away in an unmarked minivan in June outside the public prosecutor's office.
