Question:
Which political party did Sylvain Maillard belong to in Jan, 2019?

Context:
 Sylvain Maillard is a member of the Les Centristes from Jan, 2007 to Jan, 2012. 
 Sylvain Maillard is a member of the La République En Marche from Jan, 2016 to Dec, 2022. 
 Sylvain Maillard is a member of the Union for French Democracy from Jan, 1999 to Jan, 2007.

Answer:
La République En Marche