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relentless heat from the southwest to the southeast. temperatures in the 100s. what all this could mean for your holiday weekend plans. rob marciano is standing by. record-breaking july 4th travel in full swing, but lingering frustrations for some. the staggering number of people screened by the tsa. thousands of delays and cancellations from the week. what you can expect for the journey home. and the ceo of united under scrutiny, taking a private plane when he couldn't even get a seat on his own airline. the new 2020 election interference allegations against former president d...

>> all right, zohreen, thank you. overseas now and a warning from ukraine's president zelenskyy, he's accusing russia of preparing to trigger an explosion at zaporizhzhia, europe's largest nuclear plant. that country conducting emergency drills this week preparing for the worst case scenario. here's abc's patrick reevell on the ground in ukraine. >> reporter: tonight, fresh concerns russia could try to freeze their southern front line by creating a nuclear catastrophe at the zaporizhzhia power plant. ukraine's president zelenskyy warning just today, "there is a serious threat. russia is read...