Throughout his tenure, Lammert has not shied from speaking out against the government about potential threats to parliament's role. He became widely respected for upholding parliamentarians' rights, including leading the way in condemning the 1915 Armenian massacres as a Turkish genocide in 2016. In 2011, he questioned why the Bundestag had not been consulted on Chancellor Angela Merkel's decision to close all nuclear plants following Fukushima Daiichi nuclear disaster. He has insisted that members of parliament be consulted fully on the bailout schemes for the euro zone debt crisis.