"The PM weakens the UPA, yet somehow we are to believe that his unknown brother will strengthen BJP. Mind-boggling logic at work here!" Omar wrote on micro-blogging site twitter.Com.
Referring to BJP's criticism of Singh as a weak Prime Minister, Omar said the national opposition party cannot have it both ways.
"The BJP goes to town calling the PM irrelevant, yet makes a song & dance of his brother joining them. How can they have it both ways?" he questioned.