If your news app is downloaded on your phone, then you will be able to get the widget back by going to the widget page on your phone and scrolling all the way to the bottom where there will be a small circle saying edit. press this and it may ask for your fingerprint to unlock or it will take you straight to the widget editing menu. You will see different widgets with a red circle and a minus sign. These are widgets already on your widget page. Below those are widgets with a green circle and a plus sign. These are widgets that are able to be added to your widget page. Your news widget should be with those additional widgets. Just press the circle and it will be added to your widget page. You can also change the location of the news widget by holding down on the 3 horizontal lines on the right of the added widget. You can move it above or below the other widgets added and will appear in this order on your widgets page.
If your news app is not on your home screen with your other installed apps. Just go to the app store and reinstall it. Then just complete the above instructions and you should be all set.
Hope this helps.