It will take more than a limp wave of support from FCC chairman Ajit Pai to convince the Department of Justice (DoJ) to approve the $26.5bn merger between T-Mobile and Sprint, despite the two telcos offering a number of concessions. A source speaking to Bloomberg last week claimed the DoJ top dogs are in favor of blocking the deal, citing anti-competitive implications. As pointed out in the report, the FCC and DoJ have never before locked horns over a major merger. But the coming months could include a war of words between Pai and DoJ chief Makan Delrahim, who famously sued to block the merger between AT&T and Time Warner back in 2017. Of course, that was a cross-industry merger…