Why Trump may be in a "very sour mood" ahead of G-7 talks

Melanie Zanona of Politico joins "CBS This Morning Saturday" to discuss the upcoming G-7 summit, and why the trade war with China and the threat of a recession may put Trump in a "very sour mood." Zanona also talks Democratic 2020 candidate Joe Biden, and his decision to ask voters to think about what would have happened if former president Barack Obama had been assasinated.