Executive Orders OR Faqwas

President Obama is issuing numerous Executive Orders, what I call Faqwas, to bypass the Congress.

Obama cannot convince Congress, cannot convince even many in his own political party, to adopt his policies. So to get around Congress he is using his power, such as it is, to issue fiats, Executive Orders, aka Faqwas in many parts of the world, to order federal agencies to implement his ideas.

So where are the court challenges?

Is it constitutional for a president to bypass Congress in this manner?