diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java
index 7c271cef6abb3..2babfe3ca544b 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java
@@ -3294,6 +3294,11 @@ public class StatusBar extends SystemUI implements DemoMode,
             }
             return true;
         }
+        if (mStatusBarWindowController.hasAssistActiveSession()) {
+            // Back pressed during an assist session, cancel it.
+            mAssistManager.hideAssist();
+            return true;
+        }
         if (mState != StatusBarState.KEYGUARD && mState != StatusBarState.SHADE_LOCKED) {
             if (mNotificationPanel.canPanelBeCollapsed()) {
                 animateCollapsePanels();
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarWindowController.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarWindowController.java
index 984ab0563fea5..2969cf35377ca 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarWindowController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarWindowController.java
@@ -208,7 +208,8 @@ public class StatusBarWindowController implements Callback, Dumpable, Configurat
                 || state.bubbleExpanded) {
             mLpChanged.flags &= ~WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
             mLpChanged.flags &= ~WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;
-        } else if (state.isKeyguardShowingAndNotOccluded() || panelFocusable) {
+        } else if (state.isKeyguardShowingAndNotOccluded() || panelFocusable
+                || state.assistActiveSession) {
             mLpChanged.flags &= ~WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
             mLpChanged.flags |= WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;
         } else {
@@ -501,9 +502,13 @@ public class StatusBarWindowController implements Callback, Dumpable, Configurat
 
     /**
      * Sets whether assist UI is showing on the screen.
+     *
+     * @param assistShowing whether any assist UI is being shown.
+     * @param activeSession whether AssistManager has an active assist session in progress.
      */
-    public void setAssistShowing(boolean assistShowing) {
+    public void setAssistState(boolean assistShowing, boolean activeSession) {
         mCurrentState.assistShowing = assistShowing;
+        mCurrentState.assistActiveSession = activeSession;
         apply(mCurrentState);
     }
 
@@ -514,6 +519,13 @@ public class StatusBarWindowController implements Callback, Dumpable, Configurat
         return mCurrentState.assistShowing;
     }
 
+    /**
+     * The AssistManager is handling an active assist session.
+     */
+    public boolean hasAssistActiveSession() {
+        return mCurrentState.assistActiveSession;
+    }
+
     /**
      * Sets if there is a bubble being expanded on the screen.
      */
@@ -590,7 +602,10 @@ public class StatusBarWindowController implements Callback, Dumpable, Configurat
         boolean notTouchable;
         boolean bubblesShowing;
         boolean bubbleExpanded;
+        // Assist manager is rendering any UI.
         boolean assistShowing;
+        // Assist manager is handling an active assist session.
+        boolean assistActiveSession;
 
         /**
          * The {@link StatusBar} state from the status bar.