A US-based political expert says US President Joe Biden "did a really good job" during this week's NATO summit in Washington D.C. despite a string of verbal gaffes. "I think it's also important to put in context the fact that Trump has also misspoken many times and he's also 78 years old. And so I think that we have to kind of step back and look at this bigger picture," Amy Austin Holmes, Research Professor of International Affairs at George Washington University, adds. SOUNDBITES