Le Roux, who was previously head of the Socialist Party group in the lower house of parliament, was appointed interior minister in December when Cazeneuve left the post to take up the job of prime minister.
French Interior Minister Bruno Le Roux stepped down on Tuesday following media reports claiming that he had employed his student-age daughters as his parliament assistants.
Fekl has been serving as junior minister for trade and promoting tourism to France.
The French financial prosecutor's office, which handles such cases and which opened an inquiry into Fillon, was not immediately available for a comment concerning Le Roux. They were given 24 short-term contracts, known as CDDs, between 2009 and 2016 while he sat in the national assembly.
The scandal over Francois Fillon's hiring of wife and two of his children has made politicians employment of family members a hot topic that forced the conservative candidate to lose the status of the presidential favorite. "It will be enlightening", he said of the Le Roux saga hours before the prosecutor's office announced that that case would be investigated too.
Le Roux said: "The responsibility demanded by the struggle against terrorism, criminality and to gain control of migratory flows means that we can not leave ourselves open to any exploitation".
Liverpool legend Ronnie Moran passes away at 83
A regular visitor to Anfield and the club's Melwood training ground, he was diagnosed with vascular dementia previous year . He played at left back for the reds and was for a time the club's major penalty taker.
However, Le Roux is under pressure to explain how the date of one contract, during the 2013 summer holidays, coincides with the time his daughter was doing work experience at the cosmetic company Yves Rocher in Belgium.
"They did work", Le Roux insisted in an earlier interview with the TMC journalist. However he said he felt it was his responsibility to resign.
Le Roux, 51, has admitted he paid his daughters, now aged 20 and 23, €55,000 of public money over seven years.
But the French public is growing frustrated with a political establishment it sees as enriching itself while average workers suffer, and there is growing public pressure for transparency.
Some of France's most prominent politicians - including former Presidents Nicolas Sarkozy and Jacques Chirac - have been embroiled in corruption scandals involving accusations from shady campaign financing to nepotism.