1: White House: Rafah strike must not cross Biden's red line.

2: Israel's ground assault in Rafah monitored by US.

3: Biden warns Israel against crossing red line in Rafah.

4: White House reacts to Israel's actions in Rafah.

5: Rafah strike must not escalate, says US administration.

6: Israel's actions in Rafah met with US concern.

7: Biden sets limits for Israel's actions in Rafah.

8: White House closely watches Israel's Rafah operation.

9: US-Israel relations tested by Rafah assault.