Why do the Republicans not speak up about the voter fraud that takes place in Philadelphia every election???

Why don’t the Republicans ever make an issue about the heavy voter fraud that goes on in Philly every four years? This is well known and even some Deomocrats are willing to admit this. Some districts in the Philly area report more people voting then there really are and know one makes an issue of it. Now that’s really sad! Ca any tell me what the plan is to prevent this from happening again this year?? If there is such plan. If the Democrats continue to launch their secret weapon, theft and fraud, then they may win Pennsylvania. They complain about voter fraud in republican areas but not when it benefits them.