EAST RUTHERFORD, N.J. — After a week of being beaten up in the media over the trade of popular star receiver Odell Beckham Jr., general manager Dave Gettleman went on the offensive, saying the trade was in the best interests of the New York Giants and was a deal the organization could not refuse.Gettleman didn’t stop there Monday, speaking for the first time since sending Beckham to the Cleveland Browns last week in return for first- and third-round draft picks this year and safety Jabrill Peppers.The executive also defended quarterback Eli Manning, saying the belief the 38-year-old two-time Super Bowl MVP can’t play well anymore is a “crock.” He laughed off the idea that the trade for 29-year-old guard Kevin Zeitler and the free agency signing of 34-year-old safety Antoine Bethea gave the Giants a couple of old players, saying both are good players and good people.When pushed about what his plan is for the Giants after winning three games in 2017 and five last season, Gettleman basically told reporters it was none of their business. He said the team is building, it has a master plan that would become apparent over time, and he would be judged by how it worked out over the next few years.In discussing Beckham, Gettleman said he only approached the Bills about a deal for the 26-year-old wideout — partly because he heard Buffalo might be getting receiver Antonio Brown from Pittsburgh, and the other part was his friendship with Bills general manager Brandon Beane, who worked for him in Carolina.Gettleman did not shop the three-time Pro Bowl pick because he felt doing that would not give him the upper hand in trade talks. He said the San Francisco 49ers called, and the teams had numerous conversations without reaching a deal.Once Browns general manager John Dorsey called on Tuesday, it took 10 hours to work out the deal. It was finalized over the weekend when Beckham and Peppers passed physicals, Gettleman said.The obvious question is why get rid of the guy who has been the record-setting catalyst of the Giants’ offense since being the No. 12 pick overall in 2014 and the offensive rookie of the year that season.“That’s the question everybody asks,” Gettleman said. “After much discussion, we believe this was in the best interests of the New York football Giants. I want everyone to know this was purely a football business decision. There is no intrigue. No he said, she said. None of that stuff.”Gettleman called Beckham a tremendous talent, but said the Giants got three assets in return, at the very least.