Does it mean "They couldn't reach an agreement"? http://www.oxfordlearnersdictionaries.com/definition/english/fodder?q=fodder+ https://www.merriam-webster.com/dictionary/fodder
"The negotiations foundered over multiple issues, but labor and the environment were not trouble-free. The reason was that the United States does not come up with brand new outlines of trade agreements every time it sits down with a partner. Each agreement builds on its predecessors. Thus, even with an advanced partner like the EU, whatever language was adopted on labor and the environment would be a strong candidate for a new trade standard, even when applied to countries with weaker protections. Hence, there was still fodder for a fight."